diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 90c0f03b65..e41351b140 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -3445,6 +3445,11 @@ var ZoteroPane = new function () {
 	 * Show context menu once it's ready
 	 */
 	this.onItemsContextMenuOpen = async function (event, x, y) {
+		// Library section headers (in a grouped cross-library view) aren't items, so
+		// don't show the item context menu when one is right-clicked
+		if (event.target?.closest?.('.library-header-row')) {
+			return;
+		}
 		await ZoteroPane.buildItemContextMenu();
 		x = x || event.screenX;
 		y = y || event.screenY;
diff --git a/test/tests/zoteroPaneTest.js b/test/tests/zoteroPaneTest.js
index a27fcbf3d0..9adb9e8d46 100644
--- a/test/tests/zoteroPaneTest.js
+++ b/test/tests/zoteroPaneTest.js
@@ -1137,7 +1137,40 @@ describe("ZoteroPane", function () {
 			await selectLibrary(win);
 			await group.eraseTx();
 		});
-		
+
+		it("shouldn't open the item context menu on a library header row", async function () {
+			let group = await createGroup();
+			let c1 = await createDataObject('collection');
+			let c2 = await createDataObject('collection', { libraryID: group.libraryID });
+			await createDataObject('item', { collections: [c1.id] });
+			await createDataObject('item', { libraryID: group.libraryID, collections: [c2.id] });
+
+			// Cross-library multiple-collection selection -> grouped view with headers
+			await zp.collectionsView.expandLibrary(group.libraryID);
+			let cv = zp.collectionsView;
+			await cv.selectByID("C" + c1.id);
+			await waitForItemsLoad(win);
+			cv.selection.toggleSelect(cv.getRowIndexByID("C" + c2.id));
+			await zp.onCollectionSelected();
+			await zp.itemsView.waitForLoad();
+
+			let headerRow = zp.itemsView.getRowIndexByID("L" + Zotero.Libraries.userLibraryID);
+			let headerNode = win.document.getElementById(`${zp.itemsView.id}-row-${headerRow}`);
+			assert.isTrue(headerNode.classList.contains('library-header-row'));
+
+			let spy = sinon.spy(zp, 'buildItemContextMenu');
+			try {
+				await zp.onItemsContextMenuOpen({ target: headerNode, screenX: 0, screenY: 0 });
+				assert.isFalse(spy.called, "Context menu shouldn't be built for a header row");
+			}
+			finally {
+				spy.restore();
+			}
+
+			await selectLibrary(win);
+			await group.eraseTx();
+		});
+
 		it("should show “Export Note…” for standalone file attachment with note", async function () {
 			var item1 = await importFileAttachment('test.png');
 			item1.setNote('<p>Foo</p>');