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-rw-r--r--ethosu/vela/supported_operators.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/ethosu/vela/supported_operators.py b/ethosu/vela/supported_operators.py
index 44292386..91fcb5ad 100644
--- a/ethosu/vela/supported_operators.py
+++ b/ethosu/vela/supported_operators.py
@@ -490,7 +490,7 @@ class SupportedOperators:
def constraint_bias_40bit(op):
"Optional Bias tensor values must fit within 40-bits"
bias = op.bias
- if bias and bias.dtype == DataType.int64:
+ if bias and bias.dtype == DataType.int64 and bias.quant_values is not None:
valid = all(len(bin(quant_value)[2:]) <= 40 for quant_value in bias.quant_values)
return valid, f"Tensor '{bias.name}' has values larger than 40-bits"
return True, "Op has no bias tensor, or it fits in 40-bit"