diff --git a/.github/workflows/fuzz.yaml b/.github/workflows/fuzz.yaml
new file mode 100755
index 00000000..dddfe31a
--- /dev/null
+++ b/.github/workflows/fuzz.yaml
@@ -0,0 +1,17 @@
+name: Fuzzing
+on: [push, pull_request]
+jobs:
+  build:
+    name: Fuzzing
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v3
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: "go.mod"
+
+      - name: Fuzz
+        run: go test ./tests -fuzz . -fuzztime=2m
diff --git a/cmd/cmd-run.go b/cmd/cmd-run.go
index 031eb335..ba784017 100755
--- a/cmd/cmd-run.go
+++ b/cmd/cmd-run.go
@@ -144,6 +144,13 @@ func run(cmd *cobra.Command, _ []string) error {
 		}
 	}
 
+	if maxReviewers < 0 {
+		return errors.New("max-reviewers should not be negative")
+	}
+	if maxTeamReviewers < 0 {
+		return errors.New("max-team-reviewers should not be negative")
+	}
+
 	vc, err := getVersionController(flag, true, false)
 	if err != nil {
 		return err
diff --git a/internal/multigitter/run.go b/internal/multigitter/run.go
index 2206ad71..079fda3e 100755
--- a/internal/multigitter/run.go
+++ b/internal/multigitter/run.go
@@ -336,6 +336,10 @@ func (r *Runner) ensurePullRequestExists(ctx context.Context, log log.FieldLogge
 		return existingPullRequest, nil
 	}
 
+	// if r.MaxReviewers == 1 {
+	// 	return nil, errors.New("oh no!")
+	// }
+
 	log.Info("Creating pull request")
 	return r.VersionController.CreatePullRequest(ctx, repo, prRepo, scm.NewPullRequest{
 		Title:         r.PullRequestTitle,
diff --git a/tests/fuzzing_test.go b/tests/fuzzing_test.go
new file mode 100644
index 00000000..768a1cfe
--- /dev/null
+++ b/tests/fuzzing_test.go
@@ -0,0 +1,132 @@
+package tests
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/lindell/multi-gitter/cmd"
+	"github.com/lindell/multi-gitter/tests/vcmock"
+	"github.com/stretchr/testify/assert"
+)
+
+func FuzzRun(f *testing.F) {
+	f.Add(
+		"assignee1,assignee2",           // assignees
+		"commit message",                // commit-message
+		1,                               // concurrent
+		"skip",                          // conflict-strategy
+		false,                           // draft
+		false,                           // dry-run
+		1,                               // fetch-depth
+		false,                           // fork
+		"fork-owner",                    // fork-owner
+		"go",                            // git-type
+		"label1,label2",                 // labels
+		"text",                          // log-format
+		"info",                          // log-level
+		1,                               // max-reviewers
+		1,                               // max-team-reviewers
+		"pr-body",                       // pr-body
+		"pr-title",                      // pr-title
+		"reviewer1,reviewer2",           // reviewers
+		false,                           // skip-forks
+		false,                           // skip-pr
+		"should-not-change",             // skip-repo
+		"team-reviewer1,team-reviewer1", // team-reviewers
+		"topic1,topic2",                 // topic
+	)
+	f.Fuzz(func(
+		t *testing.T,
+
+		assignees string,
+		commitMessage string,
+		concurrent int,
+		conflictStrategy string,
+		draft bool,
+		dryRun bool,
+		fetchDepth int,
+		fork bool,
+		forkOwner string,
+		gitType string,
+		labels string,
+		logFormat string,
+		logLevel string,
+		maxReviewers int,
+		maxTeamReviewers int,
+		prBody string,
+		prTitle string,
+		reviewers string,
+		skipForks bool,
+		skipPr bool,
+		skipRepo string,
+		teamReviewers string,
+		topic string,
+	) {
+		vcMock := &vcmock.VersionController{}
+		defer vcMock.Clean()
+		cmd.OverrideVersionController = vcMock
+
+		tmpDir, err := os.MkdirTemp(os.TempDir(), "multi-git-test-run-")
+		defer os.RemoveAll(tmpDir)
+		assert.NoError(t, err)
+
+		workingDir, err := os.Getwd()
+		assert.NoError(t, err)
+
+		changerBinaryPath := normalizePath(filepath.Join(workingDir, changerBinaryPath))
+
+		changeRepo := createRepo(t, "owner", "should-change", "i like apples")
+		changeRepo2 := createRepo(t, "owner", "should-change-2", "i like my apple")
+		noChangeRepo := createRepo(t, "owner", "should-not-change", "i like oranges")
+		vcMock.AddRepository(changeRepo)
+		vcMock.AddRepository(changeRepo2)
+		vcMock.AddRepository(noChangeRepo)
+
+		runOutFile := filepath.Join(tmpDir, "run-out.txt")
+		runLogFile := filepath.Join(tmpDir, "run-log.txt")
+
+		command := cmd.RootCmd()
+		command.SetArgs([]string{"run",
+			"--output", runOutFile,
+			"--log-file", runLogFile,
+			"--author-name", "Test Author",
+			"--author-email", "test@example.com",
+			"--assignees", assignees,
+			"--commit-message", commitMessage,
+			"--concurrent", fmt.Sprint(concurrent),
+			"--conflict-strategy", conflictStrategy,
+			fmt.Sprintf("--draft=%t", draft),
+			fmt.Sprintf("--dry-run=%t", dryRun),
+			"--fetch-depth", fmt.Sprint(fetchDepth),
+			fmt.Sprintf("--fork=%t", fork),
+			"--fork-owner", forkOwner,
+			"--git-type", gitType,
+			"--labels", labels,
+			"--log-format", logFormat,
+			"--log-level", logLevel,
+			"--max-reviewers", fmt.Sprint(maxReviewers),
+			"--max-team-reviewers", fmt.Sprint(maxTeamReviewers),
+			"--pr-body", prBody,
+			"--pr-title", prTitle,
+			"--reviewers", reviewers,
+			fmt.Sprintf("--skip-forks=%t", skipForks),
+			fmt.Sprintf("--skip-pr=%t", skipPr),
+			"--skip-repo", skipRepo,
+			"--team-reviewers", teamReviewers,
+			"--topic", topic,
+			changerBinaryPath,
+		})
+		err = command.Execute()
+		if err != nil {
+			assert.NotContains(t, err.Error(), "panic")
+		}
+
+		// Verify that the output was correct
+		runOutData, _ := os.ReadFile(runOutFile)
+		assert.NotContains(t, string(runOutData), "panic")
+		runLogData, _ := os.ReadFile(runLogFile)
+		assert.NotContains(t, string(runLogData), "panic")
+	})
+}
diff --git a/tests/testdata/fuzz/FuzzRun/87fbf8b977926b2c b/tests/testdata/fuzz/FuzzRun/87fbf8b977926b2c
new file mode 100644
index 00000000..23c3a7c9
--- /dev/null
+++ b/tests/testdata/fuzz/FuzzRun/87fbf8b977926b2c
@@ -0,0 +1,24 @@
+go test fuzz v1
+string("0")
+string("0")
+int(69)
+string("skip")
+bool(false)
+bool(false)
+int(1)
+bool(true)
+string("0")
+string("go")
+string("0")
+string("text")
+string("info")
+int(1)
+int(-51)
+string("0")
+string("0")
+string("0")
+bool(false)
+bool(false)
+string("0")
+string("0")
+string("0")
diff --git a/tests/testdata/fuzz/FuzzRun/ae23ef40ab4bebdf b/tests/testdata/fuzz/FuzzRun/ae23ef40ab4bebdf
new file mode 100644
index 00000000..15a49f29
--- /dev/null
+++ b/tests/testdata/fuzz/FuzzRun/ae23ef40ab4bebdf
@@ -0,0 +1,24 @@
+go test fuzz v1
+string("0")
+string("0")
+int(1)
+string("0")
+bool(false)
+bool(false)
+int(1)
+bool(false)
+string("0")
+string("0")
+string("0")
+string("0")
+string("0")
+int(1)
+int(1)
+string("0")
+string("0")
+string("0")
+bool(false)
+bool(false)
+string("0")
+string("0")
+string("0")