diff --git a/libimagstore/src/error.rs b/libimagstore/src/error.rs
index 697143fc..4ad9c5f2 100644
--- a/libimagstore/src/error.rs
+++ b/libimagstore/src/error.rs
@@ -34,6 +34,7 @@ pub enum StoreErrorKind {
     PostHookExecuteError,
     StorePathLacksVersion,
     GlobError,
+    EncodingError,
         // maybe more
 }
 
@@ -64,6 +65,7 @@ fn store_error_type_as_str(e: &StoreErrorKind) -> &'static str {
         &StoreErrorKind::PostHookExecuteError  => "Post-Hook execution error",
         &StoreErrorKind::StorePathLacksVersion => "The supplied store path has no version part",
         &StoreErrorKind::GlobError => "glob() error",
+        &StoreErrorKind::EncodingError => "Encoding error",
     }
 }
 
diff --git a/libimagstore/src/store.rs b/libimagstore/src/store.rs
index 0122cf06..201386d5 100644
--- a/libimagstore/src/store.rs
+++ b/libimagstore/src/store.rs
@@ -315,10 +315,11 @@ impl Store {
         if let Some(path) = path.to_str() {
             let path = [ path, "/*" ].join("");
             debug!("glob()ing with '{}'", path);
-            glob(&path[..]).map(StoreIdIterator::new)
+            glob(&path[..])
+                .map(StoreIdIterator::new)
                 .map_err(|e| StoreError::new(StoreErrorKind::GlobError, Some(Box::new(e))))
         } else {
-            unimplemented!()
+            Err(StoreError::new(StoreErrorKind::EncodingError, None))
         }
     }