diff --git a/src/compiler.rs b/src/compiler.rs
index b7c6020..198041d 100644
--- a/src/compiler.rs
+++ b/src/compiler.rs
@@ -70,10 +70,10 @@ impl MultiSpan {
             .collect()
     }
 
-    fn primary_line(&self, source_map: &SourceMap) -> usize {
+    fn primary_line(&self, source_map: &SourceMap) -> Option<usize> {
         let labels = self.internal_labels(source_map);
-        let label = labels.iter().find(|l| l.primary).unwrap();
-        pos_of_span(label.span.span(), source_map).0
+        let label = labels.iter().find(|l| l.primary)?;
+        Some(pos_of_span(label.span.span(), source_map).0)
     }
 }
 
@@ -1501,7 +1501,7 @@ impl TypeCheckingResult {
 #[derive(Debug, Clone)]
 pub struct TypeError {
     pub message: String,
-    pub line: usize,
+    pub line: Option<usize>,
     pub fix: Option<PossibleFix>,
 }
 
diff --git a/src/translation.rs b/src/translation.rs
index 4c63ac5..5deb7d8 100644
--- a/src/translation.rs
+++ b/src/translation.rs
@@ -176,13 +176,15 @@ impl<'a> FixContext<'a> {
         if let Some(res) = &self.result {
             let prefix_lines = self.prefix_lines();
             for error in &res.errors {
-                assert!(
-                    error.line == 1 || error.line > prefix_lines,
-                    "{}\n\n{}\n\n{}",
-                    self.prefix,
-                    self.code,
-                    error.message
-                );
+                if let Some(line) = error.line {
+                    assert!(
+                        line == 1 || line > prefix_lines,
+                        "{}\n\n{}\n\n{}",
+                        self.prefix,
+                        self.code,
+                        error.message
+                    );
+                }
             }
         }
     }
@@ -480,7 +482,10 @@ impl<'ast> Translator<'ast> {
                     wo_errors += 1;
                     wo_error_names.push(*name);
                     let callees = &transitive[name];
-                    if callees.iter().all(|c| translated[c].no_error()) {
+                    if callees.iter().all(|c| {
+                        let t = some_or!(translated.get(c), return true);
+                        t.no_error()
+                    }) {
                         no_trans_errors += 1;
                         no_trans_error_names.push(*name);
                     }