diff --git a/NEWS b/NEWS
index f22175b69..92e8671cb 100644
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,7 @@ Bug fixes
  - [web] fixed handling of attachments in mail editor (#4058, #4063)
  - [web] fixed saving draft outside Mail module (#4071)
  - [web] fixed SCAYT automatic language selection in HTML editor
+ - [web] fixed task sorting on multiple categories
 
 3.2.7 (2017-02-14)
 ------------------
diff --git a/UI/Scheduler/NSArray+Scheduler.m b/UI/Scheduler/NSArray+Scheduler.m
index 0309e0226..ff4025671 100644
--- a/UI/Scheduler/NSArray+Scheduler.m
+++ b/UI/Scheduler/NSArray+Scheduler.m
@@ -266,7 +266,12 @@
   NSComparisonResult result;
 
   selfCategory = [self objectAtIndex: taskCategoryIndex];
+  if ([selfCategory isKindOfClass: [NSArray class]])
+    selfCategory = [(id)selfCategory lastObject];
+
   otherCategory = [otherTask objectAtIndex: taskCategoryIndex];
+  if ([otherCategory isKindOfClass: [NSArray class]])
+    otherCategory = [(id)otherCategory lastObject];
 
   if ([selfCategory isNotNull] && [otherCategory isNotNull])
     result = [selfCategory caseInsensitiveCompare: otherCategory];