fix

iOSClient/Share/CCShareOC.m

@@ -152,6 +152,16 @@
 {
     AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
     
+    // bugfix
+    if (!self.serverUrl || !self.metadata) {
+        
+        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.1 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
+            [self dismissViewControllerAnimated:YES completion:nil];
+        });
+        
+        return;
+    }
+    
     self.shareLink = [appDelegate.sharesLink objectForKey:[self.serverUrl stringByAppendingString:self.metadata.fileName]];
     self.shareUserAndGroup = [appDelegate.sharesUserAndGroup objectForKey:[self.serverUrl stringByAppendingString:self.metadata.fileName]];