4 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/python/bmesh/bmesh_py_types.c b/source/blender/python/bmesh/bmesh_py_types.c
index 612446e6d19..e5e601e0eb6 100644
--- a/source/blender/python/bmesh/bmesh_py_types.c
+++ b/source/blender/python/bmesh/bmesh_py_types.c
@@ -3241,9 +3241,11 @@ static PyObject *bpy_bmelemseq_subscript(BPy_BMElemSeq *self, PyObject *key)
       const Py_ssize_t len = bpy_bmelemseq_length(self);
       if (start < 0) {
         start += len;
+        CLAMP_MIN(start, 0);
       }
       if (stop < 0) {
         stop += len;
+        CLAMP_MIN(stop, 0);
       }
     }
 
diff --git a/source/blender/python/bmesh/bmesh_py_types_customdata.c b/source/blender/python/bmesh/bmesh_py_types_customdata.c
index ff06cf43026..0aa92158524 100644
--- a/source/blender/python/bmesh/bmesh_py_types_customdata.c
+++ b/source/blender/python/bmesh/bmesh_py_types_customdata.c
@@ -843,9 +843,11 @@ static PyObject *bpy_bmlayercollection_subscript(BPy_BMLayerCollection *self, Py
       const Py_ssize_t len = bpy_bmlayercollection_length(self);
       if (start < 0) {
         start += len;
+        CLAMP_MIN(start, 0);
       }
       if (stop < 0) {
         stop += len;
+        CLAMP_MIN(stop, 0);
       }
     }
 
diff --git a/source/blender/python/bmesh/bmesh_py_types_select.c b/source/blender/python/bmesh/bmesh_py_types_select.c
index 99f17bcec8f..b89822a080c 100644
--- a/source/blender/python/bmesh/bmesh_py_types_select.c
+++ b/source/blender/python/bmesh/bmesh_py_types_select.c
@@ -273,9 +273,11 @@ static PyObject *bpy_bmeditselseq_subscript(BPy_BMEditSelSeq *self, PyObject *ke
       const Py_ssize_t len = bpy_bmeditselseq_length(self);
       if (start < 0) {
         start += len;
+        CLAMP_MIN(start, 0);
       }
       if (stop < 0) {
         stop += len;
+        CLAMP_MIN(stop, 0);
       }
     }
 
diff --git a/source/blender/python/intern/bpy_rna.c b/source/blender/python/intern/bpy_rna.c
index dff96f74d62..ec2e70ad262 100644
--- a/source/blender/python/intern/bpy_rna.c
+++ b/source/blender/python/intern/bpy_rna.c
@@ -2825,9 +2825,11 @@ static PyObject *pyrna_prop_collection_subscript(BPy_PropertyRNA *self, PyObject
       const Py_ssize_t len = (Py_ssize_t)RNA_property_collection_length(&self->ptr, self->prop);
       if (start < 0) {
         start += len;
+        CLAMP_MIN(start, 0);
       }
       if (stop < 0) {
         stop += len;
+        CLAMP_MIN(stop, 0);
       }
     }
 
@@ -2955,9 +2957,11 @@ static int pyrna_prop_collection_ass_subscript(BPy_PropertyRNA *self,
         Py_ssize_t len = (Py_ssize_t)RNA_property_collection_length(&self->ptr, self->prop);
         if (start < 0) {
           start += len;
+          CLAMP_MIN(start, 0);
         }
         if (stop < 0) {
           stop += len;
+          CLAMP_MIN(stop, 0);
         }
       }