diff --git a/bshell.runtime/runtime/scope.c b/bshell.runtime/runtime/scope.c
index b3b0dc2..7617ca1 100644
--- a/bshell.runtime/runtime/scope.c
+++ b/bshell.runtime/runtime/scope.c
@@ -90,10 +90,25 @@ void bshell_runtime_scope_set_block(
 		bshell_scriptblock_unref(scope->s_block);
 	}
 
-	scope->s_block = bshell_scriptblock_ref(block);
-	scope->s_ip = 0;
-	bshell_scriptblock_get_text(block, &scope->s_instr, &scope->s_nr_instr);
-	bshell_scriptblock_get_pool(block, &scope->s_pool, &scope->s_nr_pool);
+	if (!block) {
+		scope->s_block = NULL;
+		scope->s_ip = 0;
+		scope->s_instr = NULL;
+		scope->s_nr_instr = 0;
+		scope->s_pool = NULL;
+		scope->s_nr_pool = 0;
+	} else {
+		scope->s_block = bshell_scriptblock_ref(block);
+		scope->s_ip = 0;
+		bshell_scriptblock_get_text(
+			block,
+			&scope->s_instr,
+			&scope->s_nr_instr);
+		bshell_scriptblock_get_pool(
+			block,
+			&scope->s_pool,
+			&scope->s_nr_pool);
+	}
 }
 
 fx_hashtable *bshell_runtime_scope_get_functions(