diff --git a/pyqtgraph/functions.py b/pyqtgraph/functions.py
index 36d85531..92ad3250 100644
--- a/pyqtgraph/functions.py
+++ b/pyqtgraph/functions.py
@@ -1903,15 +1903,15 @@ def _arrayToQPath_all(x, y, finiteCheck):
     numchunks = (n + chunksize - 1) // chunksize
     minchunks = 3
 
+    backfill_idx = None
+    if finiteCheck and not all_isfinite:
+        backfill_idx = _compute_backfill_indices(isfinite)
+
     if numchunks < minchunks:
         # too few chunks, batching would be a pessimization
         poly = create_qpolygonf(n)
         arr = ndarray_from_qpolygonf(poly)
 
-        backfill_idx = None
-        if finiteCheck and not all_isfinite:
-            backfill_idx = _compute_backfill_indices(isfinite)
-
         if backfill_idx is None:
             arr[:, 0] = x
             arr[:, 1] = y
@@ -1925,10 +1925,6 @@ def _arrayToQPath_all(x, y, finiteCheck):
         path.addPolygon(poly)
         return path
 
-    backfill_idx = None
-    if finiteCheck and not all_isfinite:
-        backfill_idx = _compute_backfill_indices(isfinite)
-
     # at this point, we have numchunks >= minchunks
 
     path = QtGui.QPainterPath()