diff --git a/src/Autodoc.zig b/src/Autodoc.zig
index f465158bc9..d865a43225 100644
--- a/src/Autodoc.zig
+++ b/src/Autodoc.zig
@@ -1266,8 +1266,13 @@ fn walkInstruction(
             try self.exprs.append(self.arena, start.expr);
             self.exprs.items[slice_index] = .{ .slice = .{ .lhs = lhs_index, .start = start_index } };
 
+            const typeRef = switch (lhs.expr) {
+                .declRef => |ref| self.decls.items[ref.Analyzed].value.typeRef,
+                else => null,
+            };
+
             return DocData.WalkResult{
-                .typeRef = self.decls.items[lhs.expr.declRef.Analyzed].value.typeRef,
+                .typeRef = typeRef,
                 .expr = .{ .sliceIndex = slice_index },
             };
         },
@@ -1311,8 +1316,13 @@ fn walkInstruction(
             try self.exprs.append(self.arena, end.expr);
             self.exprs.items[slice_index] = .{ .slice = .{ .lhs = lhs_index, .start = start_index, .end = end_index } };
 
+            const typeRef = switch (lhs.expr) {
+                .declRef => |ref| self.decls.items[ref.Analyzed].value.typeRef,
+                else => null,
+            };
+
             return DocData.WalkResult{
-                .typeRef = self.decls.items[lhs.expr.declRef.Analyzed].value.typeRef,
+                .typeRef = typeRef,
                 .expr = .{ .sliceIndex = slice_index },
             };
         },
@@ -1364,10 +1374,20 @@ fn walkInstruction(
             try self.exprs.append(self.arena, end.expr);
             const sentinel_index = self.exprs.items.len;
             try self.exprs.append(self.arena, sentinel.expr);
-            self.exprs.items[slice_index] = .{ .slice = .{ .lhs = lhs_index, .start = start_index, .end = end_index, .sentinel = sentinel_index } };
+            self.exprs.items[slice_index] = .{ .slice = .{
+                .lhs = lhs_index,
+                .start = start_index,
+                .end = end_index,
+                .sentinel = sentinel_index,
+            } };
+
+            const typeRef = switch (lhs.expr) {
+                .declRef => |ref| self.decls.items[ref.Analyzed].value.typeRef,
+                else => null,
+            };
 
             return DocData.WalkResult{
-                .typeRef = self.decls.items[lhs.expr.declRef.Analyzed].value.typeRef,
+                .typeRef = typeRef,
                 .expr = .{ .sliceIndex = slice_index },
             };
         },
@@ -1432,8 +1452,13 @@ fn walkInstruction(
                 .sentinel = sentinel_index,
             } };
 
+            const typeRef = switch (lhs.expr) {
+                .declRef => |ref| self.decls.items[ref.Analyzed].value.typeRef,
+                else => null,
+            };
+
             return DocData.WalkResult{
-                .typeRef = self.decls.items[lhs.expr.declRef.Analyzed].value.typeRef,
+                .typeRef = typeRef,
                 .expr = .{ .sliceIndex = slice_index },
             };
         },