diff --git a/yakut/VERSION b/yakut/VERSION
index a803cc2..930e300 100644
--- a/yakut/VERSION
+++ b/yakut/VERSION
@@ -1 +1 @@
-0.14.0
+0.14.1
diff --git a/yakut/subject_specifier_processor.py b/yakut/subject_specifier_processor.py
index 8357e40..8f44901 100644
--- a/yakut/subject_specifier_processor.py
+++ b/yakut/subject_specifier_processor.py
@@ -41,7 +41,7 @@ async def process_subject_specifier(
         sp_sbj_id, sp_dty = specifier.split(":")
         _logger.info("Subject specifier interpreted as explicit: %r", (sp_sbj_id, sp_dty))
         subject_id = _parse_subject_id(sp_sbj_id)
-        if not subject_id:
+        if subject_id is None:
             raise BadSpecifierError(f"{subject_id} is not a valid subject-ID")
         return subject_id, dtype_loader.load_dtype(sp_dty)