diff --git a/src/main/java/org/verapdf/wcag/algorithms/semanticalgorithms/utils/NodeUtils.java b/src/main/java/org/verapdf/wcag/algorithms/semanticalgorithms/utils/NodeUtils.java
index 298a2290..6ecd5c66 100644
--- a/src/main/java/org/verapdf/wcag/algorithms/semanticalgorithms/utils/NodeUtils.java
+++ b/src/main/java/org/verapdf/wcag/algorithms/semanticalgorithms/utils/NodeUtils.java
@@ -73,7 +73,7 @@ public static double headingProbability(SemanticTextNode textNode, INode neighbo
 		}
 		SemanticTextNode neighborTextNode = (SemanticTextNode) neighborNode;
 		double probability;
-		if (textNode.getFontName().equals(neighborTextNode.getFontName())) {
+		if (textNode.getFontName() != null && textNode.getFontName().equals(neighborTextNode.getFontName())) {
 			probability = headingProbability(textNode, neighborTextNode, HEADING_PROBABILITY_PARAMS_SAME_FONT,
 			                                 HEADING_EPSILONS[0], HEADING_EPSILONS[0]);
 		} else {