diff --git a/src/py_converters.cpp b/src/py_converters.cpp
index cd4013bb30ad..d8aa384cd08b 100644
--- a/src/py_converters.cpp
+++ b/src/py_converters.cpp
@@ -510,8 +510,8 @@ int convert_points(PyObject *obj, void *pointsp)
     if (obj == NULL || obj == Py_None) {
         return 1;
     }
-    points->set(obj);
-    if (points->size() && !check_trailing_shape(*points, "points", 2)) {
+    if (!points->set(obj)
+        || points->size() && !check_trailing_shape(*points, "points", 2)) {
         return 0;
     }
     return 1;
@@ -523,8 +523,8 @@ int convert_transforms(PyObject *obj, void *transp)
     if (obj == NULL || obj == Py_None) {
         return 1;
     }
-    trans->set(obj);
-    if (trans->size() && !check_trailing_shape(*trans, "transforms", 3, 3)) {
+    if (!trans->set(obj)
+        || trans->size() && !check_trailing_shape(*trans, "transforms", 3, 3)) {
         return 0;
     }
     return 1;
@@ -536,8 +536,8 @@ int convert_bboxes(PyObject *obj, void *bboxp)
     if (obj == NULL || obj == Py_None) {
         return 1;
     }
-    bbox->set(obj);
-    if (bbox->size() && !check_trailing_shape(*bbox, "bbox array", 2, 2)) {
+    if (!bbox->set(obj)
+        || bbox->size() && !check_trailing_shape(*bbox, "bbox array", 2, 2)) {
         return 0;
     }
     return 1;
@@ -549,8 +549,8 @@ int convert_colors(PyObject *obj, void *colorsp)
     if (obj == NULL || obj == Py_None) {
         return 1;
     }
-    colors->set(obj);
-    if (colors->size() && !check_trailing_shape(*colors, "colors", 4)) {
+    if (!colors->set(obj)
+        || colors->size() && !check_trailing_shape(*colors, "colors", 4)) {
         return 0;
     }
     return 1;