diff --git a/FDFullscreenPopGesture/UINavigationController+FDFullscreenPopGesture.m b/FDFullscreenPopGesture/UINavigationController+FDFullscreenPopGesture.m
index 914f217..eecc741 100644
--- a/FDFullscreenPopGesture/UINavigationController+FDFullscreenPopGesture.m
+++ b/FDFullscreenPopGesture/UINavigationController+FDFullscreenPopGesture.m
@@ -105,6 +105,7 @@ - (void)fd_viewWillAppear:(BOOL)animated
     
     if (self.fd_willAppearInjectBlock) {
         self.fd_willAppearInjectBlock(self, animated);
+        self.fd_willAppearInjectBlock = nil;
     }
 }