diff --git a/lib/hooks/input-state-container-hooks.js b/lib/hooks/input-state-container-hooks.js
--- a/lib/hooks/input-state-container-hooks.js
+++ b/lib/hooks/input-state-container-hooks.js
@@ -129,8 +129,9 @@
       );
 
       const threadInfo = threadInfos[messageInfo.threadID];
+      const isThickThread = threadInfo && threadTypeIsThick(threadInfo.type);
 
-      if (!threadTypeIsThick(threadInfo.type) && isLegacy) {
+      if (!isThickThread && isLegacy) {
         const mediaIDs = [];
         for (const { id } of messageInfo.media) {
           mediaIDs.push(id);
@@ -149,7 +150,7 @@
         };
       }
 
-      if (!threadTypeIsThick(threadInfo.type) && !isLegacy) {
+      if (!isThickThread && !isLegacy) {
         const mediaMessageContents = getMediaMessageServerDBContentsFromMedia(
           messageInfo.media,
         );