diff --git a/src/annotations/gutterBlameAnnotationProvider.ts b/src/annotations/gutterBlameAnnotationProvider.ts
index aa4cc52..0fd7b1e 100644
--- a/src/annotations/gutterBlameAnnotationProvider.ts
+++ b/src/annotations/gutterBlameAnnotationProvider.ts
@@ -191,7 +191,7 @@ export class GutterBlameAnnotationProvider extends BlameAnnotationProviderBase {
 				sha = commitLine?.sha;
 			}
 		} else {
-			sha = first(blame.commits.values()).sha;
+			sha = first(blame.commits.values())?.sha;
 		}
 
 		if (!sha) {
diff --git a/src/codelens/codeLensProvider.ts b/src/codelens/codeLensProvider.ts
index 46560a2..79340b9 100644
--- a/src/codelens/codeLensProvider.ts
+++ b/src/codelens/codeLensProvider.ts
@@ -480,9 +480,11 @@ export class GitCodeLensProvider implements CodeLensProvider {
 
 	private resolveGitRecentChangeCodeLens(lens: GitRecentChangeCodeLens, _token: CancellationToken): CodeLens {
 		const blame = lens.getBlame();
-		if (blame === undefined) return lens;
+		if (blame == null) return lens;
 
 		const recentCommit = first(blame.commits.values());
+		if (recentCommit == null) return lens;
+
 		// TODO@eamodio This is FAR too expensive, but this accounts for commits that delete lines -- is there another way?
 		// if (lens.uri != null) {
 		// 	const commit = await this.container.git.getCommitForFile(lens.uri.repoPath, lens.uri.fsPath, {
@@ -564,11 +566,10 @@ export class GitCodeLensProvider implements CodeLensProvider {
 
 	private resolveGitAuthorsCodeLens(lens: GitAuthorsCodeLens, _token: CancellationToken): CodeLens {
 		const blame = lens.getBlame();
-		if (blame === undefined) return lens;
+		if (blame == null) return lens;
 
 		const count = blame.authors.size;
-
-		const author = first(blame.authors.values()).name;
+		const author = first(blame.authors.values())?.name ?? 'Unknown';
 
 		let title = `${count} ${count > 1 ? 'authors' : 'author'} (${author}${count > 1 ? ' and others' : ''})`;
 		if (configuration.get('debug')) {
@@ -589,6 +590,7 @@ export class GitCodeLensProvider implements CodeLensProvider {
 		}
 
 		const commit = find(blame.commits.values(), c => c.author.name === author) ?? first(blame.commits.values());
+		if (commit == null) return lens;
 
 		switch (lens.desiredCommand) {
 			case CodeLensCommand.CopyRemoteCommitUrl:
diff --git a/src/commands/copyShaToClipboard.ts b/src/commands/copyShaToClipboard.ts
index 7a88bc0..541ddfa 100644
--- a/src/commands/copyShaToClipboard.ts
+++ b/src/commands/copyShaToClipboard.ts
@@ -65,7 +65,8 @@ export class CopyShaToClipboardCommand extends ActiveEditorCommand {
 					const log = await this.container.git.getLog(repoPath, { limit: 1 });
 					if (log == null) return;
 
-					args.sha = first(log.commits.values()).sha;
+					args.sha = first(log.commits.values())?.sha;
+					if (args.sha == null) return;
 				} else if (args.sha == null) {
 					const blameline = editor?.selection.active.line ?? 0;
 					if (blameline < 0) return;
diff --git a/src/commands/remoteProviders.ts b/src/commands/remoteProviders.ts
index c00165c..bcde509 100644
--- a/src/commands/remoteProviders.ts
+++ b/src/commands/remoteProviders.ts
@@ -62,7 +62,7 @@ export class ConnectRemoteProviderCommand extends Command {
 			if (repos.size === 0) return false;
 			if (repos.size === 1) {
 				let repo;
-				[repo, remote] = first(repos);
+				[repo, remote] = first(repos)!;
 				repoPath = repo.path;
 			} else {
 				const pick = await RepositoryPicker.show(
@@ -153,7 +153,7 @@ export class DisconnectRemoteProviderCommand extends Command {
 			if (repos.size === 0) return undefined;
 			if (repos.size === 1) {
 				let repo;
-				[repo, remote] = first(repos);
+				[repo, remote] = first(repos)!;
 				repoPath = repo.path;
 			} else {
 				const pick = await RepositoryPicker.show(
diff --git a/src/env/node/git/localGitProvider.ts b/src/env/node/git/localGitProvider.ts
index 1a5b2d7..11516ca 100644
--- a/src/env/node/git/localGitProvider.ts
+++ b/src/env/node/git/localGitProvider.ts
@@ -1279,8 +1279,8 @@ export class LocalGitProvider implements GitProvider, Disposable {
 			if (blame == null) return undefined;
 
 			return {
-				author: first(blame.authors.values()),
-				commit: first(blame.commits.values()),
+				author: first(blame.authors.values())!,
+				commit: first(blame.commits.values())!,
 				line: blame.lines[editorLine],
 			};
 		} catch {
@@ -1330,8 +1330,8 @@ export class LocalGitProvider implements GitProvider, Disposable {
 			if (blame == null) return undefined;
 
 			return {
-				author: first(blame.authors.values()),
-				commit: first(blame.commits.values()),
+				author: first(blame.authors.values())!,
+				commit: first(blame.commits.values())!,
 				line: blame.lines[editorLine],
 			};
 		} catch {
diff --git a/src/system/iterable.ts b/src/system/iterable.ts
index eb6a904..ae47f67 100644
--- a/src/system/iterable.ts
+++ b/src/system/iterable.ts
@@ -107,8 +107,8 @@ export function find<T>(source: Iterable<T> | IterableIterator<T>, predicate: (i
 	return null;
 }
 
-export function first<T>(source: Iterable<T> | IterableIterator<T>): T {
-	return source[Symbol.iterator]().next().value as T;
+export function first<T>(source: Iterable<T> | IterableIterator<T>): T | undefined {
+	return source[Symbol.iterator]().next().value as T | undefined;
 }
 
 export function* flatMap<T, TMapped>(
diff --git a/src/views/nodes/branchTrackingStatusNode.ts b/src/views/nodes/branchTrackingStatusNode.ts
index 0eceb5a..7af300b 100644
--- a/src/views/nodes/branchTrackingStatusNode.ts
+++ b/src/views/nodes/branchTrackingStatusNode.ts
@@ -92,7 +92,7 @@ export class BranchTrackingStatusNode extends ViewNode<ViewsWithCommits> impleme
 					ref: commit.sha,
 				});
 				if (previousLog != null) {
-					commits[commits.length - 1] = first(previousLog.commits.values());
+					commits[commits.length - 1] = first(previousLog.commits.values())!;
 				}
 			}
 		} else {