diff --git a/inventree_wireviz/version.py b/inventree_wireviz/version.py
index 884c74c..f9eab6d 100644
--- a/inventree_wireviz/version.py
+++ b/inventree_wireviz/version.py
@@ -1,3 +1,3 @@
 """Version information for the inventree-wireviz plugin"""
 
-PLUGIN_VERSION = "0.3.0"
+PLUGIN_VERSION = "0.3.1"
diff --git a/inventree_wireviz/wireviz.py b/inventree_wireviz/wireviz.py
index f12feaa..be8e7c4 100644
--- a/inventree_wireviz/wireviz.py
+++ b/inventree_wireviz/wireviz.py
@@ -526,6 +526,11 @@ def convert_quantity(self, quantity, unit, base_unit):
             The converted quantity, or the original quantity if conversion failed
         """
 
+        # Ignore unit if quantity not given
+        # Will be specified in the part units anyway
+        if not unit:
+            return quantity
+
         logger.debug(f"WirevizPlugin: Converting quantity {quantity} {unit} to {base_unit}")
 
         q = f"{quantity} {unit}"