diff --git a/mozilla/webtools/bugzilla/.bzrrev b/mozilla/webtools/bugzilla/.bzrrev
index 07e9b82587c..9500187357e 100644
--- a/mozilla/webtools/bugzilla/.bzrrev
+++ b/mozilla/webtools/bugzilla/.bzrrev
@@ -1 +1 @@
-7835
\ No newline at end of file
+7836
\ No newline at end of file
diff --git a/mozilla/webtools/bugzilla/Bugzilla/Bug.pm b/mozilla/webtools/bugzilla/Bugzilla/Bug.pm
index 4f5c0f236fe..369c6669d4f 100644
--- a/mozilla/webtools/bugzilla/Bugzilla/Bug.pm
+++ b/mozilla/webtools/bugzilla/Bugzilla/Bug.pm
@@ -2140,7 +2140,13 @@ sub _set_global_validator {
 # other_bugs to set_all in order for it to behave properly.
 sub set_all {
     my $self = shift;
-    my ($params) = @_;
+    my ($input_params) = @_;
+    
+    # Clone the data as we are going to alter it, and this would affect
+    # subsequent bugs when calling set_all() again, as some fields would
+    # be modified or no longer defined.
+    my $params = {};
+    %$params = %$input_params;
 
     # You cannot mark bugs as duplicate when changing several bugs at once
     # (because currently there is no way to check for duplicate loops in that