diff --git a/core/definitions.mk b/core/definitions.mk
index 1a9276cc5..698f52ca0 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -417,7 +417,7 @@ endef
 define find-subdir-assets
 $(sort $(if $(1),$(patsubst ./%,%, \
 	$(shell if [ -d $(1) ] ; then cd $(1) ; find -L ./ -not -name '.*' -and -type f ; fi)), \
-	$(warning Empty argument supplied to find-subdir-assets) \
+	$(warning Empty argument supplied to find-subdir-assets in $(LOCAL_PATH)) \
 ))
 endef
 
diff --git a/core/package_internal.mk b/core/package_internal.mk
index af1d2a5dc..5dd021ccd 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -140,9 +140,9 @@ my_overlay_resources := $(strip \
     $(addprefix $(d)/, \
         $(call find-subdir-assets,$(d)))))
 
-my_res_resources := $(strip \
+my_res_resources := $(if $(my_res_dir),$(strip \
     $(addprefix $(my_res_dir)/, \
-        $(call find-subdir-assets,$(my_res_dir))))
+        $(call find-subdir-assets,$(my_res_dir)))))
 
 all_resources := $(strip $(my_res_resources) $(my_overlay_resources))