diff --git a/SoObjects/SOGo/WORequest+SOGo.m b/SoObjects/SOGo/WORequest+SOGo.m
index d66a95021..b807fa0ab 100644
--- a/SoObjects/SOGo/WORequest+SOGo.m
+++ b/SoObjects/SOGo/WORequest+SOGo.m
@@ -251,7 +251,7 @@
 
   b = (
         (
-          [[cc userAgent] rangeOfString: @"macOS/13"].location != NSNotFound
+          nil != [cc userAgent] && [[cc userAgent] rangeOfString: @"macOS/13"].location != NSNotFound
           && [[cc userAgent] rangeOfString: @"dataaccessd"].location != NSNotFound
         )
        );