diff --git a/src/components/Sing/ScoreSequencer.vue b/src/components/Sing/ScoreSequencer.vue
index 73a68ff000..5a45daa335 100644
--- a/src/components/Sing/ScoreSequencer.vue
+++ b/src/components/Sing/ScoreSequencer.vue
@@ -331,6 +331,7 @@ export default defineComponent({
     let dragStartNoteNumber = 0;
     let dragStartGuideLineTicks = 0;
     let draggingNoteId = ""; // FIXME: 無効状態はstring以外の型にする
+    let executePreviewProcess = false;
     let edited = false; // プレビュー終了時にScoreの変更を行うかどうかを表す変数
     // ダブルクリック
     let mouseDownNoteId: string | undefined;
@@ -518,17 +519,20 @@ export default defineComponent({
     };
 
     const preview = () => {
-      if (previewMode === "ADD") {
-        previewAdd();
-      }
-      if (previewMode === "MOVE") {
-        previewMove();
-      }
-      if (previewMode === "RESIZE_RIGHT") {
-        previewResizeRight();
-      }
-      if (previewMode === "RESIZE_LEFT") {
-        previewResizeLeft();
+      if (executePreviewProcess) {
+        if (previewMode === "ADD") {
+          previewAdd();
+        }
+        if (previewMode === "MOVE") {
+          previewMove();
+        }
+        if (previewMode === "RESIZE_RIGHT") {
+          previewResizeRight();
+        }
+        if (previewMode === "RESIZE_LEFT") {
+          previewResizeLeft();
+        }
+        executePreviewProcess = false;
       }
       previewRequestId = requestAnimationFrame(preview);
     };
@@ -628,6 +632,7 @@ export default defineComponent({
       dragStartNoteNumber = cursorNoteNumber;
       dragStartGuideLineTicks = guideLineTicks;
       draggingNoteId = note.id;
+      executePreviewProcess = true;
       edited = mode === "ADD";
       copiedNotesForPreview.clear();
       for (const copiedNote of copiedNotes) {
@@ -706,7 +711,9 @@ export default defineComponent({
       cursorX = getXInBorderBox(event.clientX, sequencerBodyElement);
       cursorY = getYInBorderBox(event.clientY, sequencerBodyElement);
 
-      if (!nowPreviewing.value) {
+      if (nowPreviewing.value) {
+        executePreviewProcess = true;
+      } else {
         const scrollLeft = sequencerBodyElement.scrollLeft;
         const cursorBaseX = (scrollLeft + cursorX) / zoomX.value;
         const cursorTicks = baseXToTick(cursorBaseX, tpqn.value);
diff --git a/src/store/singing.ts b/src/store/singing.ts
index 3733dea1f9..d99a094976 100644
--- a/src/store/singing.ts
+++ b/src/store/singing.ts
@@ -1060,7 +1060,10 @@ export const singingStore = createPartialStore<SingingStoreTypes>({
             continue;
           }
 
-          if (phrase.state === "WAITING_TO_BE_RENDERED") {
+          if (
+            phrase.state === "WAITING_TO_BE_RENDERED" ||
+            phrase.state === "COULD_NOT_RENDER"
+          ) {
             commit("SET_STATE_TO_PHRASE", {
               phraseKey,
               phraseState: "NOW_RENDERING",
@@ -1073,14 +1076,20 @@ export const singingStore = createPartialStore<SingingStoreTypes>({
           if (!phrase.query) {
             const engineId = phrase.singer.engineId;
             const frameRate = state.engineManifests[engineId].frameRate;
-            const restDurationSeconds = 1; // 仮置き
+            const restDurationSeconds = 1; // 前後の休符の長さはとりあえず1秒に設定
 
             const frameAudioQuery = await fetchQuery(
               phrase.singer.engineId,
               phrase.score,
               frameRate,
               restDurationSeconds
-            );
+            ).catch((error) => {
+              commit("SET_STATE_TO_PHRASE", {
+                phraseKey,
+                phraseState: "COULD_NOT_RENDER",
+              });
+              throw error;
+            });
             const phonemes = getPhonemes(frameAudioQuery);
 
             window.electron.logInfo(
@@ -1124,7 +1133,17 @@ export const singingStore = createPartialStore<SingingStoreTypes>({
             if (phraseData.blob) {
               window.electron.logInfo(`Loaded audio buffer from cache.`);
             } else {
-              phraseData.blob = await synthesize(phrase.singer, phrase.query);
+              const blob = await synthesize(phrase.singer, phrase.query).catch(
+                (error) => {
+                  commit("SET_STATE_TO_PHRASE", {
+                    phraseKey,
+                    phraseState: "COULD_NOT_RENDER",
+                  });
+                  throw error;
+                }
+              );
+
+              phraseData.blob = blob;
               phraseAudioBlobCache.set(phraseKey, phraseData.blob);
 
               window.electron.logInfo(`Synthesized.`);