Generator results into a fatal error in 2.13.9 (newest not tested)

**Describe the bug**

The following code results in a fatal error.

```
TEST_CASE("Generator test") {
SECTION("a") {
SECTION("aa") {}
SECTION("ab") {}
}
SECTION("b") {}

GENERATE(true, false);
}
```

**Expected behavior**

No error at all.

**Reproduction steps**

Build and run the example above

**Platform information:**

- OS: **Linux**
- Compiler+version: **GCC v11.3**
- Catch version: **v2.13.9**

**Additional context**
Add any other context about the problem here.