diff --git a/src/backend/src/services/drivers/CoercionService.js b/src/backend/src/services/drivers/CoercionService.js
index ceadd4923..8ccb59407 100644
--- a/src/backend/src/services/drivers/CoercionService.js
+++ b/src/backend/src/services/drivers/CoercionService.js
@@ -66,11 +66,13 @@ class CoercionService extends BaseService {
             coerce: async typed_value => {
                 console.debug('coercion is running!');
 
-                const response = await secureAxiosRequest(CoercionService.MODULES.axios,
-                                typed_value.value,
-                                {
-                                    responseType: 'stream',
-                                });
+                const response = await secureAxiosRequest(
+                    CoercionService.MODULES.axios,
+                    typed_value.value,
+                    {
+                        responseType: 'stream',
+                    },
+                );
 
                 return new TypedValue({
                     $: 'stream',
@@ -89,11 +91,13 @@ class CoercionService extends BaseService {
                 content_type: 'video',
             },
             coerce: async typed_value => {
-                const response = await secureAxiosRequest(CoercionService.MODULES.axios,
-                                typed_value.value,
-                                {
-                                    responseType: 'stream',
-                                });
+                const response = await secureAxiosRequest(
+                    CoercionService.MODULES.axios,
+                    typed_value.value,
+                    {
+                        responseType: 'stream',
+                    },
+                );
 
                 return new TypedValue({
                     $: 'stream',
@@ -172,7 +176,7 @@ class CoercionService extends BaseService {
             return coerced;
         }
 
-        return typed_value;
+        return undefined;
     }
 }
 
diff --git a/src/backend/src/services/drivers/DriverService.js b/src/backend/src/services/drivers/DriverService.js
index a39c0b821..775f4b9a9 100644
--- a/src/backend/src/services/drivers/DriverService.js
+++ b/src/backend/src/services/drivers/DriverService.js
@@ -182,11 +182,15 @@ class DriverService extends BaseService {
                 col_types.set(k, types[k]);
             }
         }
-        await services.emit('driver.register.interfaces',
-                        { col_interfaces });
+        await services.emit(
+            'driver.register.interfaces',
+            { col_interfaces },
+        );
 
-        await services.emit('driver.register.drivers',
-                        { col_drivers });
+        await services.emit(
+            'driver.register.drivers',
+            { col_drivers },
+        );
     }
 
     // This is a bit meta: we register the "driver" driver interface.
@@ -421,8 +425,10 @@ class DriverService extends BaseService {
         }
 
         const svc_permission = this.services.get('permission');
-        const reading = await svc_permission.scan(actor,
-                        PermissionUtil.join('service', service_name, 'ii', iface));
+        const reading = await svc_permission.scan(
+            actor,
+            PermissionUtil.join('service', service_name, 'ii', iface),
+        );
         const options = PermissionUtil.reading_to_options(reading);
         if ( options.length <= 0 ) {
             throw APIError.create('forbidden');
@@ -480,9 +486,11 @@ class DriverService extends BaseService {
                         const svc_rateLimit = this.services.get('rate-limit');
 
                         await svc_su.sudo(policy_holder, async () => {
-                            await svc_rateLimit.check_and_increment(`V1:${service_name}:${iface}:${method}`,
-                                            effective_policy['rate-limit'].max,
-                                            effective_policy['rate-limit'].period);
+                            await svc_rateLimit.check_and_increment(
+                                `V1:${service_name}:${iface}:${method}`,
+                                effective_policy['rate-limit'].max,
+                                effective_policy['rate-limit'].period,
+                            );
                         });
                         return args;
                     },
@@ -519,7 +527,10 @@ class DriverService extends BaseService {
                                     : method_spec.result.type
                                     ;
                             const svc_coercion = this.services.get('coercion');
-                            result = await svc_coercion.coerce(desired_type, result);
+                            const coerced = await svc_coercion.coerce(desired_type, result);
+                            if ( coerced ) {
+                                result = coerced;
+                            }
                         }
                         return result;
                     },