diff --git a/chrome/content/zotero/xpcom/utilities.js b/chrome/content/zotero/xpcom/utilities.js
index 872a3f598..70ea26c5f 100644
--- a/chrome/content/zotero/xpcom/utilities.js
+++ b/chrome/content/zotero/xpcom/utilities.js
@@ -1446,14 +1446,15 @@ Zotero.Utilities = {
 			let msg = (obj.message ? ('' + obj.message).replace(/^/gm, level_padding).trim() : '');
 			if (obj.stack) {
 				let stack = obj.stack.trim().replace(/^(?=.)/gm, level_padding);
+				stack = Zotero.Utilities.Internal.filterStack(stack);
 				
 				msg += '\n\n';
 				
 				// At least with Zotero.HTTP.UnexpectedStatusException, the stack contains "Error:"
 				// and the message in addition to the trace. I'm not sure what's causing that
 				// (Bluebird?), but fix it here.
-				if (obj.stack.startsWith('Error:')) {
-					msg += obj.stack.replace('Error: ' + obj.message + '\n', '');
+				if (stack.startsWith('Error:')) {
+					msg += stack.replace('Error: ' + obj.message + '\n', '');
 				}
 				else {
 					msg += stack;
diff --git a/chrome/content/zotero/xpcom/utilities_internal.js b/chrome/content/zotero/xpcom/utilities_internal.js
index e8b9896e9..df74d48da 100644
--- a/chrome/content/zotero/xpcom/utilities_internal.js
+++ b/chrome/content/zotero/xpcom/utilities_internal.js
@@ -1123,6 +1123,13 @@ Zotero.Utilities.Internal = {
 	},
 	
 	
+	filterStack: function (stack) {
+		return stack.split(/\n/)
+			.filter(line => !line.includes('resource://zotero/bluebird'))
+			.join('\n');
+	},
+	
+	
 	quitZotero: function(restart=false) {
 		Zotero.debug("Zotero.Utilities.Internal.quitZotero() is deprecated -- use quit()");
 		this.quit(restart);
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index 3b695bdce..ea74f4966 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -768,8 +768,10 @@ Services.scriptloader.loadSubScript("resource://zotero/polyfill.js");
 					throw e;
 				}
 				
-				Zotero.startupError = Zotero.getString('startupError.databaseUpgradeError') + "\n\n"
-					+ (e.stack || e);
+				let stack = e.stack ? Zotero.Utilities.Internal.filterStack(e.stack) : null;
+				Zotero.startupError = Zotero.getString('startupError.databaseUpgradeError')
+					+ "\n\n"
+					+ (stack || e);
 				throw e;
 			}
 			
@@ -899,7 +901,8 @@ Services.scriptloader.loadSubScript("resource://zotero/polyfill.js");
 					);
 			}
 			else {
-				Zotero.startupError = Zotero.getString('startupError') + "\n\n" + (e.stack || e);
+				let stack = e.stack ? Zotero.Utilities.Internal.filterStack(e.stack) : null;
+				Zotero.startupError = Zotero.getString('startupError') + "\n\n" + (stack || e);
 			}
 			
 			Zotero.debug(e.toString(), 1);