From 736c59125c86343723957298351225f21dbb78b5 Mon Sep 17 00:00:00 2001
From: Mason Reed <mason@vector35.com>
Date: Tue, 26 May 2026 10:34:21 -0400
Subject: [WARP] Fix crash when no default calling convention is registered

Fixes https://github.com/Vector35/binaryninja-api/issues/8181
---
 plugins/warp/src/convert/types.rs | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/plugins/warp/src/convert/types.rs b/plugins/warp/src/convert/types.rs
index 6969ac67..93cae0fc 100644
--- a/plugins/warp/src/convert/types.rs
+++ b/plugins/warp/src/convert/types.rs
@@ -274,13 +274,13 @@ pub fn from_bn_calling_convention(raw_cc: BNRef<BNCallingConvention>) -> Calling
 pub fn to_bn_calling_convention<A: BNArchitecture>(
     arch: &A,
     calling_convention: &CallingConvention,
-) -> BNRef<BNCallingConvention> {
+) -> Option<BNRef<BNCallingConvention>> {
     for cc in &arch.calling_conventions() {
         if cc.name().as_str() == calling_convention.name {
-            return cc.clone();
+            return Some(cc.clone());
         }
     }
-    arch.get_default_calling_convention().unwrap()
+    None
 }
 
 // Always pass the architecture unless you know what you're doing!
@@ -443,9 +443,11 @@ pub fn to_bn_type<A: BNArchitecture + Copy>(arch: Option<A>, ty: &Type) -> BNRef
             // TODO: Variable arguments
             let variable_args = false;
             // If we have a calling convention we run the extended function type creation.
-            match (c.calling_convention.as_ref(), arch.as_ref()) {
-                (Some(cc), Some(arch)) => {
-                    let calling_convention = to_bn_calling_convention(arch, cc);
+            let default_cc = arch.and_then(|a| a.get_default_calling_convention());
+            match (c.calling_convention.as_ref(), arch.as_ref(), default_cc) {
+                (Some(cc), Some(arch), Some(default_cc)) => {
+                    let calling_convention =
+                        to_bn_calling_convention(arch, cc).unwrap_or(default_cc);
                     BNType::function_with_opts(
                         &return_type,
                         &params,
@@ -454,7 +456,7 @@ pub fn to_bn_type<A: BNArchitecture + Copy>(arch: Option<A>, ty: &Type) -> BNRef
                         BNConf::new(0, 0),
                     )
                 }
-                (_, _) => BNType::function(&return_type, params, variable_args),
+                (_, _, _) => BNType::function(&return_type, params, variable_args),
             }
         }
         TypeClass::Referrer(c) => {
-- 
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