diff --git a/app/src/main/java/org/autojs/autojs/ui/edit/editor/JavaScriptHighlighter.java b/app/src/main/java/org/autojs/autojs/ui/edit/editor/JavaScriptHighlighter.java
index 750ce697..5df892fc 100644
--- a/app/src/main/java/org/autojs/autojs/ui/edit/editor/JavaScriptHighlighter.java
+++ b/app/src/main/java/org/autojs/autojs/ui/edit/editor/JavaScriptHighlighter.java
@@ -93,6 +93,9 @@ public class JavaScriptHighlighter implements SimpleTextWatcher.AfterTextChanged
     }
 
     public void updateTokens(String sourceString) {
+        if(mTheme == null){
+            return;
+        }
         final int id = mRunningHighlighterId.incrementAndGet();
         mExecutorService.execute(() -> {
             try {
diff --git a/autojs/src/main/assets/init.js b/autojs/src/main/assets/init.js
index 74814858..7918ea99 100644
--- a/autojs/src/main/assets/init.js
+++ b/autojs/src/main/assets/init.js
@@ -31,7 +31,9 @@ runtime.init();
         var len = functions.length;
         for(var i = 0; i < len; i++) {
             var funcName = functions[i];
-            global[funcName] = obj[funcName].bind(obj);
+            if(obj[funcName]){
+                global[funcName] = obj[funcName].bind(obj);
+            }
         }
     }
 
diff --git a/autojs/src/main/assets/modules/__images__.js b/autojs/src/main/assets/modules/__images__.js
index 7cebf282..ce45ad4c 100644
--- a/autojs/src/main/assets/modules/__images__.js
+++ b/autojs/src/main/assets/modules/__images__.js
@@ -2,7 +2,9 @@
 module.exports = function (runtime, scope) {
     function images(){
     }
-    util.__assignFunctions__(runtime.images, images, ['requestScreenCapture', 'captureScreen', 'read', 'copy', 'load', 'clip', 'pixel'])
+    if(android.os.Build.VERSION.SDK_INT >= 21){
+        util.__assignFunctions__(runtime.images, images, ['requestScreenCapture', 'captureScreen', 'read', 'copy', 'load', 'clip', 'pixel'])
+    }
     images.opencvImporter =  JavaImporter(
          org.opencv.core.Point,
          org.opencv.core.Point3,