Fixed -- IndexError: pop from empty list

django_select2/__init__.py

@@ -9,4 +9,4 @@ The app includes Select2 driven Django Widgets and Form Fields.
 
 """
 
-__version__ = "5.1.0"
+__version__ = "5.1.1"

django_select2/forms.py

@@ -335,7 +335,7 @@ class ModelSelect2Mixin(object):
         term = term.replace('\n', ' ')
         for t in [t for t in term.split(' ') if not t == '']:
             select &= reduce(lambda x, y: x | Q(**{y: t}), search_fields,
-                             Q(**{search_fields.pop(): t}))
+                             Q(**{search_fields[0]: t}))
         return queryset.filter(select).distinct()
 
     def get_queryset(self):

tests/test_forms.py

@@ -154,6 +154,13 @@ class TestModelSelect2Mixin(TestHeavySelect2Mixin):
         widget = TitleModelSelect2Widget(queryset=Genre.objects.all())
         assert widget.filter_queryset(genres[0].title[:3]).exists()
 
+        widget = TitleModelSelect2Widget(search_fields=['title__icontains'],
+                                         queryset=Genre.objects.all())
+        qs = widget.filter_queryset(" ".join([genres[0].title[:3], genres[0].title[3:]]))
+        assert qs.exists()
+
+
+
     def test_model_kwarg(self):
         widget = ModelSelect2Widget(model=Genre, search_fields=['title__icontains'])
         genre = Genre.objects.last()