diff --git a/libs/checkpoint-sqlite/src/index.ts b/libs/checkpoint-sqlite/src/index.ts
index 6740bb220..d069a181c 100644
--- a/libs/checkpoint-sqlite/src/index.ts
+++ b/libs/checkpoint-sqlite/src/index.ts
@@ -297,6 +297,18 @@ CREATE TABLE IF NOT EXISTS writes (
   ): Promise<RunnableConfig> {
     this.setup();
 
+    const thread_id = config.configurable?.thread_id;
+    const checkpoint_ns = config.configurable?.checkpoint_ns ?? "";
+    const parent_checkpoint_id = config.configurable?.checkpoint_id;
+
+    if (!config.configurable) {
+      throw new Error("Empty configuration supplied.");
+    }
+
+    if (!thread_id) {
+      throw new Error("Missing thread_id field in config.configurable.");
+    }
+
     const [type1, serializedCheckpoint] = this.serde.dumpsTyped(checkpoint);
     const [type2, serializedMetadata] = this.serde.dumpsTyped(metadata);
     if (type1 !== type2) {
@@ -305,10 +317,10 @@ CREATE TABLE IF NOT EXISTS writes (
       );
     }
     const row = [
-      config.configurable?.thread_id?.toString(),
-      config.configurable?.checkpoint_ns,
+      thread_id,
+      checkpoint_ns,
       checkpoint.id,
-      config.configurable?.checkpoint_id,
+      parent_checkpoint_id,
       type1,
       serializedCheckpoint,
       serializedMetadata,
@@ -322,8 +334,8 @@ CREATE TABLE IF NOT EXISTS writes (
 
     return {
       configurable: {
-        thread_id: config.configurable?.thread_id,
-        checkpoint_ns: config.configurable?.checkpoint_ns,
+        thread_id,
+        checkpoint_ns,
         checkpoint_id: checkpoint.id,
       },
     };
diff --git a/libs/checkpoint-sqlite/src/tests/checkpoints.test.ts b/libs/checkpoint-sqlite/src/tests/checkpoints.test.ts
index 3cc088303..c5498b54d 100644
--- a/libs/checkpoint-sqlite/src/tests/checkpoints.test.ts
+++ b/libs/checkpoint-sqlite/src/tests/checkpoints.test.ts
@@ -60,6 +60,7 @@ describe("SqliteSaver", () => {
     expect(runnableConfig).toEqual({
       configurable: {
         thread_id: "1",
+        checkpoint_ns: "",
         checkpoint_id: checkpoint1.id,
       },
     });
diff --git a/libs/checkpoint-validation/src/spec/put.ts b/libs/checkpoint-validation/src/spec/put.ts
index d4a731efa..71c7d2039 100644
--- a/libs/checkpoint-validation/src/spec/put.ts
+++ b/libs/checkpoint-validation/src/spec/put.ts
@@ -177,37 +177,29 @@ export function putTests<T extends BaseCheckpointSaver>(
       });
     });
 
-    it_skipForSomeModules(initializer.checkpointerName, {
-      // TODO: SqliteSaver stores with undefined namespace instead of empty namespace
-      // see: https://github.com/langchain-ai/langgraphjs/issues/592
-      "@langchain/langgraph-checkpoint-sqlite":
-        "TODO: SqliteSaver stores config with no checkpoint_ns instead of default namespace",
-    })(
-      "should default to empty namespace if the checkpoint namespace is missing from config.configurable",
-      async () => {
-        const missingNamespaceConfig: RunnableConfig = {
-          configurable: { thread_id },
-        };
-
-        const { checkpoint, metadata } = initialCheckpointTuple({
-          thread_id,
-          checkpoint_id: checkpoint_id1,
-          checkpoint_ns: "",
-        });
+    it("should default to empty namespace if the checkpoint namespace is missing from config.configurable", async () => {
+      const missingNamespaceConfig: RunnableConfig = {
+        configurable: { thread_id },
+      };
+
+      const { checkpoint, metadata } = initialCheckpointTuple({
+        thread_id,
+        checkpoint_id: checkpoint_id1,
+        checkpoint_ns: "",
+      });
 
-        const returnedConfig = await checkpointer.put(
-          missingNamespaceConfig,
-          checkpoint,
-          metadata!,
-          {}
-        );
-
-        expect(returnedConfig).not.toBeUndefined();
-        expect(returnedConfig?.configurable).not.toBeUndefined();
-        expect(returnedConfig?.configurable?.checkpoint_ns).not.toBeUndefined();
-        expect(returnedConfig?.configurable?.checkpoint_ns).toEqual("");
-      }
-    );
+      const returnedConfig = await checkpointer.put(
+        missingNamespaceConfig,
+        checkpoint,
+        metadata!,
+        {}
+      );
+
+      expect(returnedConfig).not.toBeUndefined();
+      expect(returnedConfig?.configurable).not.toBeUndefined();
+      expect(returnedConfig?.configurable?.checkpoint_ns).not.toBeUndefined();
+      expect(returnedConfig?.configurable?.checkpoint_ns).toEqual("");
+    });
 
     it_skipForSomeModules(initializer.checkpointerName, {
       // TODO: all of the checkpointers below store full channel_values on every put, rather than storing deltas