diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e064556..6ad1f178 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.17.3] - 2024-01-25
+
+### Fixed
+
+- DAP: `nil` safety in standalone files [[#182](https://github.com/mrcjkb/rustaceanvim/issues/182)].
+
 ## [3.17.2] - 2024-01-22
 
 ### Fixed
diff --git a/lua/rustaceanvim/commands/debuggables.lua b/lua/rustaceanvim/commands/debuggables.lua
index 72f26fb2..52efd17a 100644
--- a/lua/rustaceanvim/commands/debuggables.lua
+++ b/lua/rustaceanvim/commands/debuggables.lua
@@ -15,7 +15,7 @@ local _dap_configuration_added = {}
 ---@field cargoArgs string[]
 ---@field cargoExtraArgs string[]
 ---@field executableArgs string[]
----@field workspaceRoot string
+---@field workspaceRoot string | nil
 
 ---@param args RADebuggableArgs
 ---@return string
diff --git a/lua/rustaceanvim/dap.lua b/lua/rustaceanvim/dap.lua
index 438b5981..2392971f 100644
--- a/lua/rustaceanvim/dap.lua
+++ b/lua/rustaceanvim/dap.lua
@@ -108,9 +108,9 @@ end
 local source_maps = {}
 
 ---See https://github.com/vadimcn/codelldb/issues/204
----@param workspace_root string
+---@param workspace_root? string
 local function generate_source_map(workspace_root)
-  if source_maps[workspace_root] then
+  if not workspace_root or source_maps[workspace_root] then
     return
   end
   get_rustc_commit_hash(function(commit_hash)
@@ -137,8 +137,9 @@ end
 ---@type {[string]: string[]}
 local init_commands = {}
 
+---@param workspace_root? string
 local function get_lldb_commands(workspace_root)
-  if init_commands[workspace_root] then
+  if not workspace_root or init_commands[workspace_root] then
     return
   end
   get_rustc_sysroot(function(rustc_sysroot)
@@ -182,9 +183,9 @@ local environments = {}
 
 -- Most succinct description: https://github.com/bevyengine/bevy/issues/2589#issuecomment-1753413600
 ---@param adapter DapExecutableConfig | DapServerConfig
----@param workspace_root string
+---@param workspace_root string | nil
 local function add_dynamic_library_paths(adapter, workspace_root)
-  if environments[workspace_root] then
+  if not workspace_root or environments[workspace_root] then
     return
   end
   compat.system({ 'rustc', '--print', 'target-libdir' }, nil, function(sc)
@@ -345,19 +346,21 @@ function M.start(args, verbose, callback)
       final_config.cwd = args.workspaceRoot
       final_config.program = executables[1]
       final_config.args = args.executableArgs or {}
-      local environment = environments[args.workspaceRoot]
+      local environment = args.workspaceRoot and environments[args.workspaceRoot]
       final_config = next(environment or {}) ~= nil
           and vim.tbl_deep_extend('force', final_config, { env = environment })
         or final_config
 
       if string.find(final_config.type, 'lldb') ~= nil then
         -- lldb specific entries
-        final_config = next(init_commands or {}) ~= nil
+        final_config = args.workspaceRoot
+            and next(init_commands or {}) ~= nil
             and vim.tbl_deep_extend('force', final_config, { initCommands = init_commands[args.workspaceRoot] })
           or final_config
 
-        local source_map = source_maps[args.workspaceRoot]
-        final_config = next(source_map or {}) ~= nil
+        local source_map = args.workspaceRoot and source_maps[args.workspaceRoot]
+        final_config = source_map
+            and next(source_map or {}) ~= nil
             and vim.tbl_deep_extend('force', final_config, { sourceMap = format_source_map(adapter, source_map) })
           or final_config
       elseif string.find(final_config.type, 'probe%-rs') ~= nil then