added a null check for give_matarar with make_local, was crashing with some data

source/blender/src/editobject.c

@@ -4562,7 +4562,7 @@ void make_local(int mode)
 					}
 					
 					matarar= (Material ***)give_matarar(ob);
-					
+					if (matarar) {
 						for(a=0; a<ob->totcol; a++) {
 							ma= (*matarar)[a];
 							if(ma)
@@ -4570,6 +4570,7 @@ void make_local(int mode)
 						}
 					}
 				}
+			}
 			base= base->next;
 		}
 	}