diff --git a/netbox/utilities/forms/fields/dynamic.py b/netbox/utilities/forms/fields/dynamic.py
index 94870451d..1a69ed117 100644
--- a/netbox/utilities/forms/fields/dynamic.py
+++ b/netbox/utilities/forms/fields/dynamic.py
@@ -43,7 +43,7 @@ class DynamicMultipleChoiceField(forms.MultipleChoiceField):
 
         if data is not None:
             self.choices = [
-                choice for choice in self.choices if choice[0] in data
+                choice for choice in self.choices if isinstance(self.choices, str) if choice[0] in data
             ]
 
         return bound_field