fix empty parameters list issue

CHANGELOG.md

@@ -8,6 +8,8 @@
 
 **Fixes**
 
+- Fix empty parameters list issue ([#821](https://github.com/getsentry/symbolic/pull/821))
+
 ## 12.6.0
 
 ### Various fixes & improvements

py/symbolic/proguard.py

@@ -1,5 +1,5 @@
 from __future__ import annotations
-from typing import Tuple
+from typing import Optional, Tuple
 
 import uuid as uuid_mod
 
@@ -81,15 +81,20 @@ def remap_method(self, klass: str, method: str) -> Tuple[str, str] | None:
         return output if len(output[0]) > 0 and len(output[1]) > 0 else None
 
     def remap_frame(
-        self, klass: str, method: str, line: int, parameters: str = ""
+        self,
+        klass: str,
+        method: str,
+        line: int,
+        parameters: Optional[str] = None,
     ) -> list[JavaStackFrame]:
         """Remaps the stackframe, given its class, method and line."""
         result = self._methodcall(
             lib.symbolic_proguardmapper_remap_frame,
             encode_str(klass),
             encode_str(method),
             line,
-            encode_str(parameters),
+            encode_str("" if parameters is None else parameters),
+            parameters is not None,
         )
 
         frames = []

symbolic-cabi/include/symbolic.h

@@ -514,7 +514,8 @@ struct SymbolicProguardRemapResult symbolic_proguardmapper_remap_frame(const str
                                                                        const struct SymbolicStr *class_,
                                                                        const struct SymbolicStr *method,
                                                                        uintptr_t line,
-                                                                       const struct SymbolicStr *parameters);
+                                                                       const struct SymbolicStr *parameters,
+                                                                       bool use_parameters);
 
 /**
  * Remaps a class name.

symbolic-cabi/src/proguard.rs

@@ -82,9 +82,10 @@ ffi_fn! {
         method: *const SymbolicStr,
         line: usize,
         parameters: *const SymbolicStr,
+        use_parameters: bool,
     ) -> Result<SymbolicProguardRemapResult> {
         let mapper = &SymbolicProguardMapper::as_rust(mapper).inner.get().mapper;
-        let frame = if (*parameters).len > 0 {
+        let frame = if use_parameters {
             StackFrame::with_parameters((*class).as_str(), (*method).as_str(), (*parameters).as_str())
         } else {
             StackFrame::new((*class).as_str(), (*method).as_str(), line)