diff --git a/Source/SLKTextViewController.h b/Source/SLKTextViewController.h
index 8d7731d8..892de451 100644
--- a/Source/SLKTextViewController.h
+++ b/Source/SLKTextViewController.h
@@ -422,13 +422,14 @@ NS_CLASS_AVAILABLE_IOS(7_0) @interface SLKTextViewController : UIViewController
 - (void)registerPrefixesForAutoCompletion:(NSArray *_Nullable)prefixes;
 
 /**
- Verifies that controller is allowed to process the textView's text for auto-completion. Default is YES.
- This is useful to disable momentarily the auto-completion feature, or to let it visible for longer time.
+ Verifies that controller is allowed to process the textView's text for auto-completion.
+ You can override this method to disable momentarily the auto-completion feature, or to let it visible for longer time.
+ You SHOULD call super to inherit some conditionals.
  
  @param text The textView's current text.
  @return YES if the controller is allowed to process the text for auto-completion.
  */
-- (BOOL)shouldProcessTextForAutoCompletion:(NSString *)text;
+- (BOOL)shouldProcessTextForAutoCompletion:(NSString *)text NS_REQUIRES_SUPER;
 
 /**
  Notifies the view controller either the autocompletion prefix or word have changed.
diff --git a/Source/SLKTextViewController.m b/Source/SLKTextViewController.m
index 96654f27..bd324171 100644
--- a/Source/SLKTextViewController.m
+++ b/Source/SLKTextViewController.m
@@ -1583,7 +1583,10 @@ - (void)registerPrefixesForAutoCompletion:(NSArray *)prefixes
 
 - (BOOL)shouldProcessTextForAutoCompletion:(NSString *)text
 {
-    // Always return YES by default.
+    if (!_registeredPrefixes || _registeredPrefixes.count == 0) {
+        return NO;
+    }
+    
     return YES;
 }