FIX: absolute_path may be nil for code added via instance_eval

railties/lib/rails/engine.rb

@@ -351,7 +351,7 @@ def inherited(base)
 
           base.called_from = begin
             call_stack = if Kernel.respond_to?(:caller_locations)
-              caller_locations.map(&:absolute_path)
+              caller_locations.map { |l| l.absolute_path || l.path }
             else
               # Remove the line number from backtraces making sure we don't leave anything behind
               caller.map { |p| p.sub(/:\d+.*/, '') }