[ CID 114564 ] Fix potential nil pointer dereference

livecodeali · livecodeali · commit d62c5511edb0 · 2016-03-23T15:35:15.000Z
diff --git a/engine/src/cmdsf.cpp b/engine/src/cmdsf.cpp
@@ -1415,16 +1415,19 @@ void MCExport::exec_ctxt(MCExecContext &ctxt)
 
     if (sformat == EX_OBJECT)
     {
+        if (image == nil)
+        {
+            ctxt . LegacyThrow(EE_EXPORT_NOTANIMAGE);
+            return;
+        }
+        
         MCObject *optr = NULL;
-        if (image != NULL)
+        //get image from chunk
+        uint4 parid;
+        if (!image->getobj(ctxt, optr, parid, True))
         {
-            //get image from chunk
-            uint4 parid;
-            if (!image->getobj(ctxt, optr, parid, True))
-            {
-                ctxt . LegacyThrow(EE_EXPORT_NOSELECTED);
-                return;
-            }
+            ctxt . LegacyThrow(EE_EXPORT_NOSELECTED);
+            return;
         }
         
         MCAutoArrayRef t_array;
