diff --git a/src/components/composer/content_editable_helper.ts b/src/components/composer/content_editable_helper.ts
index 3ab9536a4..f114cf4c4 100644
--- a/src/components/composer/content_editable_helper.ts
+++ b/src/components/composer/content_editable_helper.ts
@@ -32,6 +32,7 @@ export class ContentEditableHelper {
         );
         if (start < 0) start = 0;
         if (end > textLength) end = textLength;
+        if (start > textLength) start = textLength;
       }
       let startNode = this.findChildAtCharacterIndex(start);
       let endNode = this.findChildAtCharacterIndex(end);
diff --git a/src/components/grid/grid.ts b/src/components/grid/grid.ts
index 36ac022b1..75e30df4d 100644
--- a/src/components/grid/grid.ts
+++ b/src/components/grid/grid.ts
@@ -466,6 +466,10 @@ export class Grid extends Component<Props, SpreadsheetChildEnv> {
   }
 
   onInput(ev: InputEvent) {
+    // the user meant to paste in the sheet, not open the composer with the pasted content
+    if (!ev.isComposing && ev.inputType === "insertFromPaste") {
+      return;
+    }
     if (ev.data) {
       // if the user types a character on the grid, it means he wants to start composing the selected cell with that
       // character
diff --git a/tests/components/grid.test.ts b/tests/components/grid.test.ts
index 5656a9695..1d5084020 100644
--- a/tests/components/grid.test.ts
+++ b/tests/components/grid.test.ts
@@ -759,6 +759,20 @@ describe("Grid component", () => {
       await nextTick();
       expect(fixture.querySelector(".o-menu")).toBeTruthy();
     });
+
+    test("input event triggered from a paste should not open composer", async () => {
+      const input = fixture.querySelector(".o-grid>input");
+      input?.dispatchEvent(
+        new InputEvent("input", {
+          data: "d",
+          bubbles: true,
+          isComposing: false,
+          inputType: "insertFromPaste",
+        })
+      );
+      await nextTick();
+      expect(model.getters.getEditionMode()).toBe("inactive");
+    });
   });
 });