Small fix

Forgot to check if program is active or not

Author: NoryiE

Basalt/objects/Program.lua

@@ -708,6 +708,9 @@ return function(name, parent)
 
         customEventHandler = function(self, event, ...)
             base.customEventHandler(self, event, ...)
+            if (curProcess == nil) then
+                return
+            end
             if(event=="basalt_resize")then
                 local w, h = pWindow.getSize()
                 local pW, pH = self:getSize()