Fix issue with scroll wheel, fixes #128

CHANGELOG.md

@@ -5,6 +5,9 @@
 - Added support for Storage Drawers void upgrade
 - Added support for Deep Storage Unit API again
 
+**Bugfixes**
+- Fixed crash when using scroll wheel
+
 ### 0.7.15
 **Bugfixes**
 - Fixed not being able to scroll with the scroll wheel using MouseTweaks

src/main/java/refinedstorage/gui/GuiBase.java

@@ -127,7 +127,7 @@ public abstract class GuiBase extends GuiContainer {
 
         int d = Mouse.getEventDWheel();
 
-        if (d != 0) {
+        if (scrollbar != null && d != 0) {
             scrollbar.wheel(d);
         }
     }