diff --git a/mantidimaging/core/utility/histogram.py b/mantidimaging/core/utility/histogram.py
index 8caeb0345b0..0ed2b63a65c 100644
--- a/mantidimaging/core/utility/histogram.py
+++ b/mantidimaging/core/utility/histogram.py
@@ -17,7 +17,8 @@ def set_histogram_log_scale(histogram: HistogramLUTItem) -> None:
     :param histogram: The HistogramLUTItem of an image.
     """
     x_data, y_data = histogram.plot.getData()
-    histogram.plot.setData(x_data, np.log(y_data + 1))
+    if y_data is not None:
+        histogram.plot.setData(x_data, np.log(y_data + 1))
 
 
 def generate_histogram_from_image(image_data: np.ndarray, num_bins: int = DEFAULT_NUM_BINS) -> tuple: