From e8ce182273e8d93d154392f6139a134dd555c8fa Mon Sep 17 00:00:00 2001
From: Aleksandr Gusev <sanekgusev@gmail.com>
Date: Sun, 29 Oct 2017 22:46:48 -0400
Subject: [PATCH] Fix potential deadlock when accessing a shared pasteboard
 from a background thread.

---
 Adjust/ADJAdditions/UIDevice+ADJAdditions.m | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Adjust/ADJAdditions/UIDevice+ADJAdditions.m b/Adjust/ADJAdditions/UIDevice+ADJAdditions.m
index 2a566a242..c991d92ae 100644
--- a/Adjust/ADJAdditions/UIDevice+ADJAdditions.m
+++ b/Adjust/ADJAdditions/UIDevice+ADJAdditions.m
@@ -102,8 +102,16 @@ - (NSString *)adjFbAttributionId {
 #if ADJUST_NO_UIPASTEBOARD || TARGET_OS_TV
     return @"";
 #else
-    NSString *result = [UIPasteboard pasteboardWithName:@"fb_app_attribution" create:NO].string;
-    if (result == nil) return @"";
+    __block NSString *result;
+    void(^resultRetrievalBlock)(void) = ^{
+        result = [UIPasteboard pasteboardWithName:@"fb_app_attribution" create:NO].string;
+        if (result == nil) {
+            result = @"";
+        }
+    };
+    [NSThread isMainThread] ?
+    resultRetrievalBlock() :
+    dispatch_sync(dispatch_get_main_queue(), resultRetrievalBlock);
     return result;
 #endif
 }