diff --git a/core/src/main/java/org/lflang/diagram/synthesis/styles/LinguaFrancaShapeExtensions.java b/core/src/main/java/org/lflang/diagram/synthesis/styles/LinguaFrancaShapeExtensions.java
index b8ee69fa1c..893d7df47b 100644
--- a/core/src/main/java/org/lflang/diagram/synthesis/styles/LinguaFrancaShapeExtensions.java
+++ b/core/src/main/java/org/lflang/diagram/synthesis/styles/LinguaFrancaShapeExtensions.java
@@ -444,6 +444,7 @@ public KPolygon addReactionFigure(KNode node, ReactionInstance reaction) {
     // optional code content
     boolean hasCode =
         getBooleanValue(LinguaFrancaSynthesis.SHOW_REACTION_CODE)
+            && reaction.getDefinition().getCode() != null
             && !StringExtensions.isNullOrEmpty(reaction.getDefinition().getCode().getBody());
     if (hasCode) {
       KText hasCodeText =