Prevent error when sourceMap option is disabled
Prevent error when sourceMap option is disabled

pnml/fuse-box,fuse-box/fuse-box,fuse-box/fuse-box,pnml/fuse-box,pnml/fuse-box,fuse-box/fuse-box,fuse-box/fuse-box,rs3d/fuse-box,rs3d/fuse-box,rs3d/fuse-box