diff --git a/src/sourcemap/CodeCoverage.zig b/src/sourcemap/CodeCoverage.zig
index 03c2e0363d..bf12e05ff2 100644
--- a/src/sourcemap/CodeCoverage.zig
+++ b/src/sourcemap/CodeCoverage.zig
@@ -394,6 +394,8 @@ pub const ByteRangeMapping = struct {
             executable_lines = try Bitset.initEmpty(allocator, line_count);
             lines_which_have_executed = try Bitset.initEmpty(allocator, line_count);
             for (blocks, 0..) |block, i| {
+                if (block.endOffset < 0) continue; // does not map to anything
+
                 const min: usize = @intCast(@min(block.startOffset, block.endOffset));
                 const max: usize = @intCast(@max(block.startOffset, block.endOffset));
                 var min_line: u32 = std.math.maxInt(u32);
@@ -473,6 +475,8 @@ pub const ByteRangeMapping = struct {
             lines_which_have_executed = try Bitset.initEmpty(allocator, line_count);
 
             for (blocks, 0..) |block, i| {
+                if (block.endOffset < 0) continue; // does not map to anything
+
                 const min: usize = @intCast(@min(block.startOffset, block.endOffset));
                 const max: usize = @intCast(@max(block.startOffset, block.endOffset));
                 var min_line: u32 = std.math.maxInt(u32);
diff --git a/test/cli/test/coverage.test.ts b/test/cli/test/coverage.test.ts
new file mode 100644
index 0000000000..af72217d02
--- /dev/null
+++ b/test/cli/test/coverage.test.ts
@@ -0,0 +1,20 @@
+import { test, expect } from "bun:test";
+import { tempDirWithFiles, bunExe, bunEnv } from "harness";
+import path from "path";
+
+test("coverage crash", () => {
+  const dir = tempDirWithFiles("cov", {
+    "demo.test.ts": `class Y {
+  #hello
+}`,
+  });
+  const result = Bun.spawnSync([bunExe(), "test", "--coverage"], {
+    cwd: dir,
+    env: {
+      ...bunEnv,
+    },
+    stdio: ["inherit", "inherit", "inherit"],
+  });
+  expect(result.exitCode).toBe(0);
+  expect(result.signalCode).toBeUndefined();
+});