diff --git a/lib/spec_store.rb b/lib/spec_store.rb
index 9cfee06..77ff8f2 100644
--- a/lib/spec_store.rb
+++ b/lib/spec_store.rb
@@ -336,7 +336,7 @@ def process_specs(specs_string, from_adapter: false)
 
         hashed_sdk_key_used = specs_json[:hashed_sdk_key_used]
         unless hashed_sdk_key_used.nil? or hashed_sdk_key_used == Statsig::HashUtils.djb2(@secret_key)
-          err_boundary.log_exception(Statsig::InvalidSDKKeyResponse.new)
+          @error_boundary.log_exception(Statsig::InvalidSDKKeyResponse.new)
           return {reason: "PARSE_RESPONSE_ERROR"}
         end
 
diff --git a/test/test_spec_store_error_boundary_usage.rb b/test/test_spec_store_error_boundary_usage.rb
new file mode 100644
index 0000000..63215a1
--- /dev/null
+++ b/test/test_spec_store_error_boundary_usage.rb
@@ -0,0 +1,69 @@
+require_relative 'test_helper'
+require 'minitest'
+require 'minitest/autorun'
+require 'statsig'
+require 'webmock/minitest'
+
+class TestSpecStoreErrorBoundaryUsage < BaseTest
+  suite :TestSpecStoreErrorBoundaryUsage
+
+  def setup
+    super
+    WebMock.enable!
+    @diagnostics = Statsig::Diagnostics.new
+    @sdk_configs = Statsig::SDKConfigs.new
+    @error_boundary = Statsig::ErrorBoundary.new('secret-key', false)
+    @options = StatsigOptions.new
+    @network = Statsig::Network.new('secret-key', @options)
+    @logger = Statsig::StatsigLogger.new(@network, @options, @error_boundary, @sdk_configs)
+  end
+
+  def teardown
+    super
+    WebMock.reset!
+    WebMock.disable!
+  end
+
+  def test_process_specs_logs_to_error_boundary_on_invalid_key
+    # This test ensures that when an invalid SDK key is detected in the response,
+    # the error is correctly logged to the error boundary.
+    # Before the fix, this would have raised a NoMethodError because it tried to call
+    # @err_boundary instead of @error_boundary.
+
+    invalid_response = {
+      feature_gates: {},
+      dynamic_configs: {},
+      layer_configs: {},
+      has_updates: true,
+      time: 123,
+      hashed_sdk_key_used: 'invalid-key-hash'
+    }.to_json
+
+    stub_request(:post, 'https://statsigapi.net/v1/sdk_exception').to_return(status: 200)
+    stub_request(:post, 'https://statsigapi.net/v1/get_id_lists').to_return(status: 200, body: '{}')
+    stub_download_config_specs.to_return(status: 200, body: invalid_response)
+
+    # SpecStore.new calls download_config_specs -> process_specs
+    # We need to ensure that hashed_sdk_key_used in the response is NOT equal to djb2(@secret_key)
+    # djb2('secret-key') is '110609353'
+
+    store = Statsig::SpecStore.new(
+      @network,
+      @options,
+      nil,
+      @diagnostics,
+      @error_boundary,
+      @logger,
+      'secret-key',
+      @sdk_configs
+    )
+
+    # Verify that the exception was logged to the error boundary endpoint
+    # The first call to log_exception for InvalidSDKKeyResponse will trigger the network request.
+    # Subsequent calls with the same exception class will be ignored by ErrorBoundary unless force: true.
+    assert_requested(:post, 'https://statsigapi.net/v1/sdk_exception', times: 1) do |req|
+      body = JSON.parse(req.body)
+      assert_equal('Statsig::InvalidSDKKeyResponse', body['exception'])
+    end
+  end
+end