diff --git a/index.html b/index.html
index fec351f..6616f4a 100644
--- a/index.html
+++ b/index.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title>SVR.JS 3.6.2</title>
+    <title>SVR.JS 3.6.3</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta charset="UTF-8" />
     <style>
@@ -12,7 +12,7 @@
     </style>
   </head>
   <body>
-    <h1>Welcome to SVR.JS 3.6.2</h1>
+    <h1>Welcome to SVR.JS 3.6.3</h1>
     <br/>
     <img src="/logo.png" style="width: 256px;" />
     <br/>
@@ -110,9 +110,7 @@
     </div>
     <p>Changes:</p>
     <ul>
-      <li>Fixed bug with ENOTDIR error (was 500, now it's 404).</li>
-      <li>Fixed bug with forbidden path checker.</li>
-      <li>Optimized regular expression creating function.</li>
+      <li>Fixed bug with directory listing generating invalid HTML with custom head containing <i>&lt;html&gt;</i> tag with attributes.</li>
     </ul>
     <p>Bugs:</p>
     <ul>
diff --git a/licenses/index.html b/licenses/index.html
index 6d7f709..3a00561 100644
--- a/licenses/index.html
+++ b/licenses/index.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title>SVR.JS 3.6.2 Licenses</title>
+    <title>SVR.JS 3.6.3 Licenses</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta charset="UTF-8" />
     <style>
@@ -12,8 +12,8 @@
     </style>
   </head>
   <body>
-    <h1>SVR.JS 3.6.2 Licenses</h1>
-    <h2>SVR.JS 3.6.2</h2>
+    <h1>SVR.JS 3.6.3 Licenses</h1>
+    <h2>SVR.JS 3.6.3</h2>
     <div style="display: inline-block; text-align: left; border-width: 2px; border-style: solid; border-color: gray; padding: 8px;">
       MIT License<br/>
       <br/>
@@ -37,7 +37,7 @@
       OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE<br/>
       SOFTWARE.<br/>
     </div>
-    <h2>Packages used by SVR.JS 3.6.2 and utilities</h2>
+    <h2>Packages used by SVR.JS 3.6.3 and utilities</h2>
     <div style="width: 100%; background-color: #ccc; border: 1px solid green; text-align: left; margin: 10px 0;">
       <div style="float: right;">License: MIT</div>
       <div style="font-size: 20px;">
diff --git a/svr.js b/svr.js
index 8666587..e510f89 100644
--- a/svr.js
+++ b/svr.js
@@ -77,7 +77,7 @@ function deleteFolderRecursive(path) {
 }
 
 var os = require("os");
-var version = "3.6.2";
+var version = "3.6.3";
 var singlethreaded = false;
 
 if (process.versions) process.versions.svrjs = version; //Inject SVR.JS into process.versions
@@ -3664,27 +3664,30 @@ if (!cluster.isMaster) {
                   res.writeHead(200, http.STATUS_CODES[200], customHeaders);
 
                   // Read custom header and footer content (if available)
-                  var heada = fs.existsSync("." + decodeURIComponent(href) + "/.dirhead".replace(/\/+/g, "/"))
+                  var customDirListingHeader = fs.existsSync("." + decodeURIComponent(href) + "/.dirhead".replace(/\/+/g, "/"))
                     ? fs.readFileSync("." + decodeURIComponent(href) + "/.dirhead".replace(/\/+/g, "/")).toString()
                     : (fs.existsSync("." + decodeURIComponent(href) + "/HEAD.html".replace(/\/+/g, "/")) && (os.platform != "win32" || href != "/"))
                       ? fs.readFileSync("." + decodeURIComponent(href) + "/HEAD.html".replace(/\/+/g, "/")).toString()
                       : "";
-                  var foota = fs.existsSync("." + decodeURIComponent(href) + "/.dirfoot".replace(/\/+/g, "/"))
+                  var customDirListingFooter = fs.existsSync("." + decodeURIComponent(href) + "/.dirfoot".replace(/\/+/g, "/"))
                     ? fs.readFileSync("." + decodeURIComponent(href) + "/.dirfoot".replace(/\/+/g, "/")).toString()
                     : (fs.existsSync("." + decodeURIComponent(href) + "/FOOT.html".replace(/\/+/g, "/")) && (os.platform != "win32" || href != "/"))
                       ? fs.readFileSync("." + decodeURIComponent(href) + "/FOOT.html".replace(/\/+/g, "/")).toString()
                       : "";
-
+                      
+                  // Check if custom header has HTML tag
+                  var headerHasHTMLTag = customDirListingHeader.replace(/<!--(?:(?:(?!--\>).)*|)(?:-->|$)/gs, "").match(/<html(?![a-zA-Z0-9])(?:"(?:\\(?:.|$)|[^\\"])*(?:"|$)|'(?:\\(?:.|$)|[^\\'])*(?:'|$)|[^'">])*(?:>|$)/si);
+                  
                   // Generate HTML head and footer based on configuration and custom content
                   var htmlHead = (!configJSON.enableDirectoryListingWithDefaultHead || head == ""
-                    ? (heada.indexOf("<html>") == -1
-                      ? "<!doctype html><html><head><title>Directory: " + decodeURIComponent(origHref).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;") + "</title><meta charset=\"UTF-8\" /><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" /></head><body>"
-                      : heada.replace("<head>", "<head><title>Directory: " + decodeURIComponent(origHref).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;") + "</title>"))
-                    : head.replace("<head>", "<head><title>Directory: " + decodeURIComponent(origHref).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;") + "</title>")) +
-      (heada.indexOf("<html>") == -1 ? heada : "") +
+                    ? (!headerHasHTMLTag
+                      ? "<!DOCTYPE html><html><head><title>Directory: " + decodeURIComponent(origHref).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;") + "</title><meta charset=\"UTF-8\" /><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" /></head><body>"
+                      : customDirListingHeader.replace(/<head>/i, "<head><title>Directory: " + decodeURIComponent(origHref).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;") + "</title>"))
+                    : head.replace(/<head>/i, "<head><title>Directory: " + decodeURIComponent(origHref).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;") + "</title>")) +
+      (!headerHasHTMLTag ? customDirListingHeader : "") +
       "<h1>Directory: " + decodeURIComponent(origHref).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;") + "</h1><table id=\"directoryListing\"> <tr> <th></th> <th>Filename</th> <th>Size</th> <th>Date</th> </tr>" + (checkPathLevel(decodeURIComponent(origHref)) < 1 ? "" : "<tr><td style=\"width: 24px;\"><img src=\"/.dirimages/return.png\" width=\"24px\" height=\"24px\" alt=\"[RET]\" /></td><td style=\"word-wrap: break-word; word-break: break-word; overflow-wrap: break-word;\"><a href=\"" + (origHref).replace(/\/+/g, "/").replace(/\/[^\/]*\/?$/, "/") + "\">Return</a></td><td></td><td></td></tr>");
 
-                  var htmlFoot = "</table><p><i>" + (exposeServerVersion ? "SVR.JS/" + version + " (" + getOS() + "; " + (process.isBun ? ("Bun/v" + process.versions.bun + "; like Node.JS/" + process.version) : ("Node.JS/" + process.version)) + ")" : "SVR.JS") + (req.headers.host == undefined ? "" : " on " + String(req.headers.host).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;")) + "</i></p>" + foota + (!configJSON.enableDirectoryListingWithDefaultHead || foot == "" ? "</body></html>" : foot);
+                  var htmlFoot = "</table><p><i>" + (exposeServerVersion ? "SVR.JS/" + version + " (" + getOS() + "; " + (process.isBun ? ("Bun/v" + process.versions.bun + "; like Node.JS/" + process.version) : ("Node.JS/" + process.version)) + ")" : "SVR.JS") + (req.headers.host == undefined ? "" : " on " + String(req.headers.host).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;")) + "</i></p>" + customDirListingFooter + (!configJSON.enableDirectoryListingWithDefaultHead || foot == "" ? "</body></html>" : foot);
 
                   if (fs.existsSync("." + decodeURIComponent(href) + "/.maindesc".replace(/\/+/g, "/"))) {
                     htmlFoot = "</table><hr/>" + fs.readFileSync("." + decodeURIComponent(href) + "/.maindesc".replace(/\/+/g, "/")) + htmlFoot;
diff --git a/tests.html b/tests.html
index 1b390d9..e63bb87 100644
--- a/tests.html
+++ b/tests.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title>SVR.JS 3.6.2 Tests</title>
+    <title>SVR.JS 3.6.3 Tests</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta charset="UTF-8" />
     <style>
@@ -12,7 +12,7 @@
     </style>
   </head>
   <body>
-    <h1>SVR.JS 3.6.2 Tests</h1>
+    <h1>SVR.JS 3.6.3 Tests</h1>
     <h2>Directory</h2>
     <iframe src="/testdir" width="50%" height="300px"></iframe>
     <h2>Directory (with query)</h2>
