diff --git a/addons/xterm-addon-serialize/benchmark/tsconfig.json b/addons/xterm-addon-serialize/benchmark/tsconfig.json
index 42aaaa1b..bf5e335c 100644
--- a/addons/xterm-addon-serialize/benchmark/tsconfig.json
+++ b/addons/xterm-addon-serialize/benchmark/tsconfig.json
@@ -14,7 +14,7 @@
       "SerializeAddon": ["../src/SerializeAddon"]
     }
   },
-  "include": ["../**/*", "../../../typings/xterm.d.ts", "../../../out/**/*"],
+  "include": ["../**/*", "../../../typings/xterm.d.ts"],
   "exclude": ["../../../**/*test.ts", "../../**/*api.ts"],
   "references": [
     { "path": "../../../src/common" },
diff --git a/src/browser/Terminal.ts b/src/browser/Terminal.ts
index 24dc7af9..23122f3f 100644
--- a/src/browser/Terminal.ts
+++ b/src/browser/Terminal.ts
@@ -820,7 +820,7 @@ export class Terminal extends CoreTerminal implements ITerminal {
 
       // normal viewport scrolling
       // conditionally stop event, if the viewport still had rows to scroll within
-      if (!this.viewport!.onWheel(ev)) {
+      if (this.viewport!.onWheel(ev)) {
         return this.cancel(ev);
       }
     }, { passive: false }));
diff --git a/src/browser/Viewport.ts b/src/browser/Viewport.ts
index f73594bf..1dfc9e3e 100644
--- a/src/browser/Viewport.ts
+++ b/src/browser/Viewport.ts
@@ -220,7 +220,7 @@ export class Viewport extends Disposable implements IViewport {
 
   private _getPixelsScrolled(ev: WheelEvent): number {
     // Do nothing if it's not a vertical scroll event
-    if (ev.deltaY === 0) {
+    if (ev.deltaY === 0 || ev.shiftKey) {
       return 0;
     }
 
@@ -241,7 +241,7 @@ export class Viewport extends Disposable implements IViewport {
    */
   public getLinesScrolled(ev: WheelEvent): number {
     // Do nothing if it's not a vertical scroll event
-    if (ev.deltaY === 0) {
+    if (ev.deltaY === 0 || ev.shiftKey) {
       return 0;
     }
 
diff --git a/src/browser/services/CharacterJoinerService.ts b/src/browser/services/CharacterJoinerService.ts
index ea65c29b..ca4f1984 100644
--- a/src/browser/services/CharacterJoinerService.ts
+++ b/src/browser/services/CharacterJoinerService.ts
@@ -176,16 +176,25 @@ export class CharacterJoinerService implements ICharacterJoinerService {
     // At this point we already know that there is at least one joiner so
     // we can just pull its value and assign it directly rather than
     // merging it into an empty array, which incurs unnecessary writes.
-    const joinedRanges: [number, number][] = this._characterJoiners[0].handler(text);
+    let allJoinedRanges: [number, number][] = [];
+    try {
+      allJoinedRanges = this._characterJoiners[0].handler(text);
+    } catch (error) {
+      console.error(error);
+    }
     for (let i = 1; i < this._characterJoiners.length; i++) {
       // We merge any overlapping ranges across the different joiners
-      const joinerRanges = this._characterJoiners[i].handler(text);
-      for (let j = 0; j < joinerRanges.length; j++) {
-        CharacterJoinerService._mergeRanges(joinedRanges, joinerRanges[j]);
+      try {
+        const joinerRanges = this._characterJoiners[i].handler(text);
+        for (let j = 0; j < joinerRanges.length; j++) {
+          CharacterJoinerService._mergeRanges(allJoinedRanges, joinerRanges[j]);
+        }
+      } catch (error) {
+        console.error(error);
       }
     }
-    this._stringRangesToCellRanges(joinedRanges, lineData, startCol);
-    return joinedRanges;
+    this._stringRangesToCellRanges(allJoinedRanges, lineData, startCol);
+    return allJoinedRanges;
   }
 
   /**
diff --git a/test/benchmark/tsconfig.json b/test/benchmark/tsconfig.json
index cac99d90..2ebe2ebe 100644
--- a/test/benchmark/tsconfig.json
+++ b/test/benchmark/tsconfig.json
@@ -21,8 +21,7 @@
   },
   "include": [
     "./**/*",
-    "../../typings/xterm.d.ts",
-    "../../out/**/*"
+    "../../typings/xterm.d.ts"
   ],
   "exclude": [
     "../../**/*test.ts"