From 14c3943e136f79b8b804ee3617453fd1c846bcfd Mon Sep 17 00:00:00 2001
From: ehesp <elliot.hesp@gmail.com>
Date: Wed, 7 Aug 2019 12:03:53 +0100
Subject: [PATCH] Fixes #2455

---
 packages/database/ios/RNFBDatabase/RNFBDatabaseQueryModule.m | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/database/ios/RNFBDatabase/RNFBDatabaseQueryModule.m b/packages/database/ios/RNFBDatabase/RNFBDatabaseQueryModule.m
index 9ce92e7c..c1f9350c 100644
--- a/packages/database/ios/RNFBDatabase/RNFBDatabaseQueryModule.m
+++ b/packages/database/ios/RNFBDatabase/RNFBDatabaseQueryModule.m
@@ -49,7 +49,8 @@ RCT_EXPORT_MODULE();
 }
 
 - (void)invalidate {
-  for (NSString *key in queryDictionary) {
+  NSArray *queryKeys = [queryDictionary allKeys];
+  for (NSString *key in queryKeys) {
     RNFBDatabaseQuery *query = queryDictionary[key];
     [query removeAllEventListeners];
     [queryDictionary removeObjectForKey:key];