diff --git a/src/main/java/eu/siacs/conversations/utils/IrregularUnicodeDetector.java b/src/main/java/eu/siacs/conversations/utils/IrregularUnicodeDetector.java
index 5cc0932493a9e7c65b7d35cdb083e4adeda8ba3b..970ae046d99da128c23da424c9b3f1278d7f5b17 100644
--- a/src/main/java/eu/siacs/conversations/utils/IrregularUnicodeDetector.java
+++ b/src/main/java/eu/siacs/conversations/utils/IrregularUnicodeDetector.java
@@ -94,7 +94,9 @@ public class IrregularUnicodeDetector {
 			String[] labels = jid.getDomain().toEscapedString().split("\\.");
 			for (int i = 0; i < labels.length; ++i) {
 				SpannableString spannableString = new SpannableString(labels[i]);
-				colorize(spannableString, patternTuple.domain.get(i), color);
+				if (patternTuple.domain.size() > i) {
+					colorize(spannableString, patternTuple.domain.get(i), color);
+				}
 				if (i != 0) {
 					builder.append('.');
 				}