diff --git a/composer/lib/dependabot/composer/file_parser.rb b/composer/lib/dependabot/composer/file_parser.rb
index 8bd8b1972a8..0d647ed888e 100644
--- a/composer/lib/dependabot/composer/file_parser.rb
+++ b/composer/lib/dependabot/composer/file_parser.rb
@@ -166,7 +166,7 @@ def git_dependency_details(package_details, requirement)
 
       def lockfile_details(name:, type:)
         key = lockfile_key(type)
-        parsed_lockfile.fetch(key, []).find { |d| d["name"] == name }
+        parsed_lockfile.fetch(key, [])&.find { |d| d["name"] == name }
       end
 
       def lockfile_key(type)
diff --git a/composer/spec/dependabot/composer/file_parser_spec.rb b/composer/spec/dependabot/composer/file_parser_spec.rb
index b266ccabb19..0802cba4971 100644
--- a/composer/spec/dependabot/composer/file_parser_spec.rb
+++ b/composer/spec/dependabot/composer/file_parser_spec.rb
@@ -49,6 +49,16 @@
       end
     end
 
+    context "null dependencies with lockfile" do
+      let(:project_name) { "null_dependencies_with_lockfile" }
+      let(:name) { "phpunit/phpunit" }
+      let(:type) { "development" }
+      describe "no dependencies" do
+        subject { dependencies }
+        its(:length) { is_expected.to be >= 0 }
+      end
+    end
+
     context "with a version specified (composer v1)" do
       let(:project_name) { "v1/minor_version" }
 
diff --git a/composer/spec/fixtures/projects/null_dependencies_with_lockfile/composer.json b/composer/spec/fixtures/projects/null_dependencies_with_lockfile/composer.json
new file mode 100644
index 00000000000..acb4fabb0d3
--- /dev/null
+++ b/composer/spec/fixtures/projects/null_dependencies_with_lockfile/composer.json
@@ -0,0 +1,41 @@
+{
+    "name": "joshuaestes/server-tools",
+    "description": "Collection of command line tools to help with server management and maintenance",
+    "keywords": [],
+    "homepage": "https://github.com/JoshuaEstes/ServerTools",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Joshua Estes",
+            "homepage": "http://joshuaestes.me"
+        },
+        {
+            "name": "Contributors",
+            "homepage": "https://github.com/JoshuaEstes/ServerTools/graphs/contributors"
+        }
+    ],
+    "minimum-stability": "dev",
+    "require": {
+        "php": ">=5.3.2",
+        "symfony/console": ">=2.1,<=2.3@dev",
+        "symfony/process": ">=2.1,<=2.3@dev",
+        "symfony/yaml": ">=2.1,<=2.3@dev",
+        "symfony/finder": ">=2.1,<=2.3@dev",
+        "symfony/filesystem": ">=2.1,<=2.3@dev"
+    },
+    "replace": {
+        "JoshuaEstes/ServerTools": "self.version"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "*",
+        "mikey179/vfsStream": "*"
+    },
+    "autoload": {
+        "psr-0": { "": "src/" }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0-dev"
+        }
+    }
+}
diff --git a/composer/spec/fixtures/projects/null_dependencies_with_lockfile/composer.lock b/composer/spec/fixtures/projects/null_dependencies_with_lockfile/composer.lock
new file mode 100644
index 00000000000..7074d4d2b21
--- /dev/null
+++ b/composer/spec/fixtures/projects/null_dependencies_with_lockfile/composer.lock
@@ -0,0 +1,249 @@
+{
+    "hash": "e031c26dc793ba069af645833f61dd89",
+    "packages": [
+        {
+            "name": "symfony/console",
+            "version": "dev-master",
+            "target-dir": "Symfony/Component/Console",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/Console",
+                "reference": "fdb2d9320106926266a0f7a5a97aab7213e11ad6"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/symfony/Console/archive/fdb2d9320106926266a0f7a5a97aab7213e11ad6.zip",
+                "reference": "fdb2d9320106926266a0f7a5a97aab7213e11ad6",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "time": "2013-01-24 15:55:08",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Symfony\\Component\\Console\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "http://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Console Component",
+            "homepage": "http://symfony.com"
+        },
+        {
+            "name": "symfony/filesystem",
+            "version": "dev-master",
+            "target-dir": "Symfony/Component/Filesystem",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/Filesystem",
+                "reference": "v2.2.0-BETA2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/symfony/Filesystem/archive/v2.2.0-BETA2.zip",
+                "reference": "v2.2.0-BETA2",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "time": "2013-01-17 15:25:59",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Symfony\\Component\\Filesystem\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "http://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Filesystem Component",
+            "homepage": "http://symfony.com"
+        },
+        {
+            "name": "symfony/finder",
+            "version": "dev-master",
+            "target-dir": "Symfony/Component/Finder",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/Finder",
+                "reference": "d33658c34672f48474a669227ca3639fa0b443e7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/symfony/Finder/archive/d33658c34672f48474a669227ca3639fa0b443e7.zip",
+                "reference": "d33658c34672f48474a669227ca3639fa0b443e7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "time": "2013-01-29 18:42:39",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Symfony\\Component\\Finder\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "http://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Finder Component",
+            "homepage": "http://symfony.com"
+        },
+        {
+            "name": "symfony/process",
+            "version": "dev-master",
+            "target-dir": "Symfony/Component/Process",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/Process",
+                "reference": "v2.2.0-BETA2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/symfony/Process/archive/v2.2.0-BETA2.zip",
+                "reference": "v2.2.0-BETA2",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "time": "2013-01-17 15:25:59",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Symfony\\Component\\Process\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "http://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Process Component",
+            "homepage": "http://symfony.com"
+        },
+        {
+            "name": "symfony/yaml",
+            "version": "dev-master",
+            "target-dir": "Symfony/Component/Yaml",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/Yaml",
+                "reference": "b293027f4030998a752a1ac06e80ae9e6bf6a763"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://github.com/symfony/Yaml/archive/b293027f4030998a752a1ac06e80ae9e6bf6a763.zip",
+                "reference": "b293027f4030998a752a1ac06e80ae9e6bf6a763",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "time": "2013-01-27 16:49:19",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.2-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Symfony\\Component\\Yaml\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "http://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Yaml Component",
+            "homepage": "http://symfony.com"
+        }
+    ],
+    "packages-dev": null,
+    "aliases": [
+
+    ],
+    "minimum-stability": "dev",
+    "stability-flags": [
+
+    ]
+}
+