diff --git a/src/models/completionmodel.cpp b/src/models/completionmodel.cpp
index fbc0deece..dca0c7732 100644
--- a/src/models/completionmodel.cpp
+++ b/src/models/completionmodel.cpp
@@ -145,7 +145,7 @@ void CompletionModel::updateCompletion()
         m_filterModel->setFullText(m_fullText);
         m_filterModel->setFilterText(m_text);
         m_filterModel->invalidate();
-    } else if (text().startsWith(QLatin1Char(':')) && !text()[1].isUpper()
+    } else if (text().startsWith(QLatin1Char(':')) && text().size() > 1 && !text()[1].isUpper()
                && (m_fullText.indexOf(QLatin1Char(':'), 1) == -1
                    || (m_fullText.indexOf(QLatin1Char(' ')) != -1 && m_fullText.indexOf(QLatin1Char(':'), 1) > m_fullText.indexOf(QLatin1Char(' '), 1)))) {
         m_filterModel->setSourceModel(m_emojiModel);