diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cb9319f491..da1309bf48 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,57 +11,57 @@ on:
       - release/*
 
 jobs:
-  # linux:
-  #   runs-on: ubuntu-latest
-  #   env:
-  #     CHILD_CONCURRENCY: "1"
-  #     GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-  #   steps:
-  #     - uses: actions/checkout@v2.2.0
-  #     # TODO: rename azure-pipelines/linux/xvfb.init to github-actions
-  #     - run: |
-  #         sudo apt-get update
-  #         sudo apt-get install -y libxkbfile-dev pkg-config libsecret-1-dev libxss1 dbus xvfb libgtk-3-0 libkrb5-dev # {{SQL CARBON EDIT}} add kerberos dep
-  #         sudo cp build/azure-pipelines/linux/xvfb.init /etc/init.d/xvfb
-  #         sudo chmod +x /etc/init.d/xvfb
-  #         sudo update-rc.d xvfb defaults
-  #         sudo service xvfb start
-  #       name: Setup Build Environment
-  #     - uses: actions/setup-node@v1
-  #       with:
-  #         node-version: 10
-  #     # TODO: cache node modules
-  #     # Increase timeout to get around latency issues when fetching certain packages
-  #     - run: |
-  #         yarn config set network-timeout 300000
-  #         yarn --frozen-lockfile
-  #       name: Install Dependencies
-  #     - run: yarn electron x64
-  #       name: Download Electron
-  #     - run: yarn gulp hygiene
-  #       name: Run Hygiene Checks
-  #     - run: yarn strict-vscode # {{SQL CARBON EDIT}} add step
-  #       name: Run Strict Compile Options
-  #     # - run: yarn monaco-compile-check {{SQL CARBON EDIT}} remove step
-  #     #   name: Run Monaco Editor Checks
-  #     - run: yarn valid-layers-check
-  #       name: Run Valid Layers Checks
-  #     - run: yarn compile
-  #       name: Compile Sources
-  #     # - run: yarn download-builtin-extensions {{SQL CARBON EDIT}} remove step
-  #     #   name: Download Built-in Extensions
-  #     - run: DISPLAY=:10 ./scripts/test.sh --tfs "Unit Tests" --coverage --runGlob "**/sql/**/*.test.js"
-  #       name: Run Unit Tests (Electron)
-  #     - run: DISPLAY=:10 ./scripts/test-extensions-unit.sh
-  #       name: Run Extension Unit Tests (Electron)
-  #       # {{SQL CARBON EDIT}} Add coveralls. We merge first to get around issue where parallel builds weren't being combined correctly
-  #     - run: node test/combineCoverage
-  #       name: Combine code coverage files
-  #     - name: Upload Code Coverage
-  #       uses: coverallsapp/github-action@v1.1.1
-  #       with:
-  #         github-token: ${{ secrets.GITHUB_TOKEN }}
-  #         path-to-lcov: "test/coverage/lcov.info"
+  linux:
+    runs-on: ubuntu-latest
+    env:
+      CHILD_CONCURRENCY: "1"
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2.2.0
+      # TODO: rename azure-pipelines/linux/xvfb.init to github-actions
+      - run: |
+          sudo apt-get update
+          sudo apt-get install -y libxkbfile-dev pkg-config libsecret-1-dev libxss1 dbus xvfb libgtk-3-0 libkrb5-dev # {{SQL CARBON EDIT}} add kerberos dep
+          sudo cp build/azure-pipelines/linux/xvfb.init /etc/init.d/xvfb
+          sudo chmod +x /etc/init.d/xvfb
+          sudo update-rc.d xvfb defaults
+          sudo service xvfb start
+        name: Setup Build Environment
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      # TODO: cache node modules
+      # Increase timeout to get around latency issues when fetching certain packages
+      - run: |
+          yarn config set network-timeout 300000
+          yarn --frozen-lockfile
+        name: Install Dependencies
+      - run: yarn electron x64
+        name: Download Electron
+      - run: yarn gulp hygiene
+        name: Run Hygiene Checks
+      - run: yarn strict-vscode # {{SQL CARBON EDIT}} add step
+        name: Run Strict Compile Options
+      # - run: yarn monaco-compile-check {{SQL CARBON EDIT}} remove step
+      #   name: Run Monaco Editor Checks
+      - run: yarn valid-layers-check
+        name: Run Valid Layers Checks
+      - run: yarn compile
+        name: Compile Sources
+      # - run: yarn download-builtin-extensions {{SQL CARBON EDIT}} remove step
+      #   name: Download Built-in Extensions
+      - run: DISPLAY=:10 ./scripts/test.sh --tfs "Unit Tests" --coverage --runGlob "**/sql/**/*.test.js"
+        name: Run Unit Tests (Electron)
+      - run: DISPLAY=:10 ./scripts/test-extensions-unit.sh
+        name: Run Extension Unit Tests (Electron)
+        # {{SQL CARBON EDIT}} Add coveralls. We merge first to get around issue where parallel builds weren't being combined correctly
+      - run: node test/combineCoverage
+        name: Combine code coverage files
+      - name: Upload Code Coverage
+        uses: coverallsapp/github-action@v1.1.1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: "test/coverage/lcov.info"
 
     # Fails with cryptic error (e.g. https://github.com/microsoft/vscode/pull/90292/checks?check_run_id=433681926#step:13:9)
     # - run: DISPLAY=:10 yarn test-browser --browser chromium
@@ -78,7 +78,7 @@ jobs:
       - uses: actions/checkout@v2.2.0
       - uses: actions/setup-node@v1
         with:
-          node-version: 10
+          node-version: 12
       - uses: actions/setup-python@v1
         with:
           python-version: "2.x"
@@ -117,7 +117,7 @@ jobs:
       - uses: actions/checkout@v2.2.0
       - uses: actions/setup-node@v1
         with:
-          node-version: 10
+          node-version: 12
       # Increase timeout to get around latency issues when fetching certain packages
       - run: |
           yarn config set network-timeout 300000
diff --git a/src/vs/base/browser/ui/actionbar/actionViewItems.ts b/src/vs/base/browser/ui/actionbar/actionViewItems.ts
index 660d00f28b..53dc37a40d 100644
--- a/src/vs/base/browser/ui/actionbar/actionViewItems.ts
+++ b/src/vs/base/browser/ui/actionbar/actionViewItems.ts
@@ -313,7 +313,19 @@ export class ActionViewItem extends BaseActionViewItem {
 			if (this.label) {
 				this.label.classList.add('codicon');
 				if (this.cssClass) {
-					this.label.classList.add(...this.cssClass.split(' '));
+					// {{SQL CARBON EDIT}} - avoid exception if class contains empty elements
+					let classList = this.cssClass.split(' ');
+					let containsEmpty = false;
+					if (classList && classList.length > 0) {
+						for (let i = 0; i < classList.length; ++i) {
+							if (classList[i] === undefined || classList[i] === '') {
+								containsEmpty = true;
+							}
+						}
+						if (!containsEmpty) {
+							this.label.classList.add(...this.cssClass.split(' '));
+						}
+					}
 				}
 			}
 
diff --git a/src/vs/workbench/contrib/welcome/page/browser/welcomePage.ts b/src/vs/workbench/contrib/welcome/page/browser/welcomePage.ts
index 685b8dc033..7c62de1c16 100644
--- a/src/vs/workbench/contrib/welcome/page/browser/welcomePage.ts
+++ b/src/vs/workbench/contrib/welcome/page/browser/welcomePage.ts
@@ -345,7 +345,10 @@ class WelcomePage extends Disposable {
 			workspaces = workspaces.filter(recent => !this.contextService.isCurrentWorkspace(isRecentWorkspace(recent) ? recent.workspace : recent.folderUri));
 			if (!workspaces.length) {
 				const recent = container.querySelector('.welcomePage') as HTMLElement;
-				recent.classList.add('emptyRecent');
+				// {{SQL CARBON EDIT}} - avoid unit test null ref
+				if (recent && recent.classList) {
+					recent.classList.add('emptyRecent');
+				}
 				return;
 			}
 			const ul = container.querySelector('.recent ul');