diff --git a/MMPickerView/MMPickerView.m b/MMPickerView/MMPickerView.m
index 0986641..945a1f3 100644
--- a/MMPickerView/MMPickerView.m
+++ b/MMPickerView/MMPickerView.m
@@ -61,6 +61,11 @@ +(void)showPickerViewInView:(UIView *)view
                 withOptions:(NSDictionary *)options
                  completion:(void (^)(NSString *))completion{
   
+  if ([[view subviews] containsObject:[self sharedView]]) {
+    // The picker is already showing.
+    return;
+  }
+  
   [[self sharedView] initializePickerViewInView:view
                                       withArray:strings
                                     withOptions:options];
@@ -77,6 +82,11 @@ +(void)showPickerViewInView:(UIView *)view
     objectToStringConverter:(NSString *(^)(id))converter
                  completion:(void (^)(id))completion {
   
+  if ([[view subviews] containsObject:[self sharedView]]) {
+    // The picker is already showing.
+    return;
+  }
+  
   [self sharedView].objectToStringConverter = converter;
   [self sharedView].onDismissCompletion = completion;
   [[self sharedView] initializePickerViewInView:view