Strict check for table.

Clocker/Preferences/CLPreferencesViewController.m

@@ -693,6 +693,9 @@ NSString *const CLTryAgainMessage = @"Try again, maybe?";
 #pragma mark -
 
 -(void)tableView:(NSTableView *)tableView didClickTableColumn:(NSTableColumn *)tableColumn
+{
+    
+    if (tableView == self.timezoneTableView)
     {
         static NSStringCompareOptions comparisonOptions = NSCaseInsensitiveSearch | NSNumericSearch | NSForcedOrderingSearch | NSWidthInsensitiveSearch;
         
@@ -744,6 +747,8 @@ NSString *const CLTryAgainMessage = @"Try again, maybe?";
         [self.timezoneTableView reloadData];
         
         [self refreshMainTableview];
+
+    }
 }
 
 #pragma mark Other Methods