diff --git a/Project.toml b/Project.toml
index 1273203..607d756 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "LoweredCodeUtils"
 uuid = "6f1432cf-f94c-5a45-995e-cdbf5db27b0b"
 authors = ["Tim Holy <tim.holy@gmail.com>"]
-version = "2.4.7"
+version = "2.4.8"
 
 [deps]
 JuliaInterpreter = "aa1ae85d-cabe-5617-a682-6adf51b2e16a"
diff --git a/src/signatures.jl b/src/signatures.jl
index 18e2890..3812876 100644
--- a/src/signatures.jl
+++ b/src/signatures.jl
@@ -146,10 +146,12 @@ function identify_framemethod_calls(frame)
     for (i, stmt) in enumerate(frame.framecode.src.code)
         isa(stmt, Expr) || continue
         if stmt.head === :global && length(stmt.args) == 1
-            key = stmt.args[1]::Symbol
-            # We don't know for sure if this is a reference to a method, but let's
-            # tentatively cue it
-            push!(refs, key=>i)
+            key = stmt.args[1]
+            if isa(key, Symbol)
+                # We don't know for sure if this is a reference to a method, but let's
+                # tentatively cue it
+                push!(refs, key=>i)
+            end
         elseif stmt.head === :thunk && stmt.args[1] isa CodeInfo
             tsrc = stmt.args[1]::CodeInfo
             if length(tsrc.code) == 1