Language acquisition has two important language activities - perception and production. The native language is the first one that a person acquires. Considering frequency of language use, native language doesn't necessarily have to be a person's first language. A person whose native language is the first language is a native speaker of that language. A second language is every second language that is acquired afterward. Comparing to the way of acquisition, it can be a second and foreign language. The acquisition of native and second languages has its similarities and differences. Deviation in language acquisition is inevitable and an indicator of new language acquisition. Writing is a language production activity for which teaching is necessary and as a learning strategy, it helps in acquiring the language. In Croatia, there are national minorities that learn the Croatian language in education as a foreign language. This paper was aimed at researching deviation in texts of second language learners written in the Croatian language. The respondents’ first language was Hungarian and they were educated in a school in Baranja by module A, better said, all the classes are in Hungarian language and they learn Croatian language only in special course Croatian language. With the analysis of texts, it will be determined which deviation is contained, do they reduce during education and how big is the extent of writing expression by age.