diff --git a/public/script.js b/public/script.js
index 7611c4340..a299f6fac 100644
--- a/public/script.js
+++ b/public/script.js
@@ -1339,11 +1339,13 @@ function cleanGroupMessage(getMessage) {
 }
 
 function getAllExtensionPrompts() {
-    return substituteParams(Object
+    const value = Object
         .values(extension_prompts)
         .filter(x => x.value)
         .map(x => x.value.trim())
-        .join('\n'));
+        .join('\n');
+
+    return value.length ? substituteParams(value) : '';
 }
 
 function getExtensionPrompt(position = 0, depth = undefined, separator = "\n") {
@@ -1359,7 +1361,9 @@ function getExtensionPrompt(position = 0, depth = undefined, separator = "\n") {
     if (extension_prompt.length && !extension_prompt.endsWith(separator)) {
         extension_prompt = extension_prompt + separator;
     }
-    extension_prompt = substituteParams(extension_prompt);
+    if (extension_prompt.length) {
+        extension_prompt = substituteParams(extension_prompt);
+    }
     return extension_prompt;
 }