Nuxt generate FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory

I'm trying to nuxt generate my static (with dynamics url params) html pages.
Here's my route config in the nuxt.config.js file

routes: function () {
      let domain = 'https://example.com'
      if (process.env.NUXT_ENV === 'dev' || process.env.NUXT_ENV === 'development') {
        domain = 'https://dev-example.com'
      }
      if (process.env.NUXT_ENV === 'local') {
        domain = 'http://localhost:3002'
      }
      let rooms = axios.get(domain + '/nuxt/rooms').then((res) => {
        if(res && res.data.length){
          return res.data.map((room) => {
            return '/manage/pro/room/' + room._id
          })
        }else{
          return []
        }
      }).catch(response => {
        console.log('errore room')
      });
      let bookings = axios.get(domain + '/nuxt/users').then((res) => {
        if(res && res.data.length){
          return res.data.map((user) => {
            return '/bookings/' + user.slug
          })
        }else {
          return []
        }
      }).catch(response => {
        console.log('errore rehearsal')
      });
      let user = axios.get(domain + '/nuxt/users').then((res) => {
        if(res && res.data.length){
          return res.data.map((user) => {
            return '/user/' + user._id + '/' + user.username
          })
        }else {
          return []
        }
      }).catch(response => {
        console.log('errore user public')
      });
      let posts = axios.get(domain + '/nuxt/posts').then((res) => {
        if(res && res.data.length){
          return res.data.map((post) => {
            return '/post/' + post._id
          })
        }else {
          return []
        }
      }).catch(response => {
        console.log('errore posts')
      });
      return Promise.all([rooms, posts, user, bookings]).then(values => {
        return values.join().split(',');
      })
    }
  },

It' has been always good and the process succeded well till today. Which it seems to require too much RAM memory. Don't know why and don't know how to fix this issue.
Here's the last console output lines 

2018-09-06T13:12:34.423Z nuxt:render Rendering url /manage/pro/room/5b3f26783e62155502337f8f

<--- Last few GCs --->

[14687:0x2c19ac0]   657918 ms: Mark-sweep 1339.9 (1440.7) -> 1328.1 (1440.2) MB, 2760.7 / 0.1 ms  (average mu = 0.224, current mu = 0.161) allocation failure scavenge might not succeed
[14687:0x2c19ac0]   661179 ms: Mark-sweep 1341.0 (1440.2) -> 1330.6 (1444.2) MB, 2752.4 / 0.1 ms  (average mu = 0.191, current mu = 0.156) allocation failure scavenge might not succeed

<--- JS stacktrace --->

==== JS stack trace =========================================

    0: ExitFrame [pc: 0x5b702a041bd]
    1: StubFrame [pc: 0x5b702a14fb2]
Security context: 0x3e9218f9e589 <JSObject>
    2: rules [0x2590b4e7c449] [/node_modules/clean-css/lib/writer/helpers.js:~46] [pc=0x5b704716ec9](this=0x3e348f706519 <JSGlobal Object>,context=0x1a44edae1691 <Object map = 0x169e1dc614d1>,tokens=0x1806c1ded131 <JSArray[2]>)
    3: all [0x2590b4e7c749] [/node_modules/clean-css/lib...

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: node::Abort() [node]
 2: 0x89375c [node]
 3: v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [node]
 4: v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [node]
 5: 0xe616b2 [node]
 6: v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [node]
 7: v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]
 8: v8::internal::Heap::AllocateRawWithRetry(int, v8::internal::AllocationSpace, v8::internal::AllocationAlignment) [node]
 9: v8::internal::Factory::NewFillerObject(int, bool, v8::internal::AllocationSpace) [node]
10: v8::internal::Runtime_AllocateInNewSpace(int, v8::internal::Object**, v8::internal::Isolate*) [node]
11: 0x5b702a041bd

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