diff --git a/devito/types/sparse.py b/devito/types/sparse.py
index dc6c225695..3e65800fbf 100644
--- a/devito/types/sparse.py
+++ b/devito/types/sparse.py
@@ -1153,7 +1153,7 @@ def __init_finalize__(self, *args, **kwargs):
         if r <= 0:
             raise ValueError('`r` must be > 0')
         # Make sure radius matches the coefficients size
-        if any(c in kwargs for c in ckeys):
+        if any(c in kwargs for c in ckeys) and self._interpolation_coeffs is not None:
             nr = self._interpolation_coeffs.shape[-1]
             if nr // 2 != r:
                 if nr == r: